Add cache/resolve endpoint and reduce footer padding

- Add POST /api/v1/cache/resolve endpoint that caches artifacts by package
  coordinates (source_type, package, version) instead of requiring a URL
- Server finds download URL from configured upstream sources (PyPI supported)
- Reduces footer padding from 24px to 12px for cleaner layout

backend/app/routes.py

@@ -8305,6 +8305,200 @@ def _create_user_cache_reference(
     return f"{user_project_name}/{user_package_name}"
 
 
+# --- Cache Resolve Endpoint ---
+
+from .schemas import CacheResolveRequest
+
+
+@router.post(
+    "/api/v1/cache/resolve",
+    response_model=CacheResponse,
+    tags=["cache"],
+    summary="Cache an artifact by package coordinates",
+)
+def cache_resolve(
+    request: Request,
+    resolve_request: CacheResolveRequest,
+    db: Session = Depends(get_db),
+    storage: S3Storage = Depends(get_storage),
+    current_user: User = Depends(get_current_user),
+):
+    """
+    Cache an artifact by package coordinates (no URL required).
+
+    The server finds the appropriate download URL based on source_type
+    and configured upstream sources. Currently supports PyPI packages.
+
+    **Request Body:**
+    - `source_type` (required): Type of source (pypi, npm, maven, etc.)
+    - `package` (required): Package name
+    - `version` (required): Package version
+    - `user_project` (optional): Also create reference in this user project
+    - `user_package` (optional): Package name in user project
+    - `user_tag` (optional): Tag name in user project
+
+    **Example (curl):**
+    ```bash
+    curl -X POST "http://localhost:8080/api/v1/cache/resolve" \\
+      -H "Authorization: Bearer <api-key>" \\
+      -H "Content-Type: application/json" \\
+      -d '{
+        "source_type": "pypi",
+        "package": "requests",
+        "version": "2.31.0"
+      }'
+    ```
+    """
+    import re
+    import httpx
+    from urllib.parse import quote, unquote
+
+    if resolve_request.source_type != "pypi":
+        raise HTTPException(
+            status_code=501,
+            detail=f"Cache resolve for '{resolve_request.source_type}' not yet implemented. Currently only 'pypi' is supported."
+        )
+
+    # Get PyPI upstream sources
+    sources = (
+        db.query(UpstreamSource)
+        .filter(
+            UpstreamSource.source_type == "pypi",
+            UpstreamSource.enabled == True,
+        )
+        .order_by(UpstreamSource.priority)
+        .all()
+    )
+
+    # Also get env sources
+    env_sources = [
+        s for s in get_env_upstream_sources()
+        if s.source_type == "pypi" and s.enabled
+    ]
+    all_sources = list(sources) + list(env_sources)
+    all_sources = sorted(all_sources, key=lambda s: s.priority)
+
+    if not all_sources:
+        raise HTTPException(
+            status_code=503,
+            detail="No PyPI upstream sources configured"
+        )
+
+    # Normalize package name (PEP 503)
+    normalized_package = re.sub(r'[-_.]+', '-', resolve_request.package).lower()
+
+    # Query the Simple API to find the download URL
+    download_url = None
+    matched_filename = None
+    last_error = None
+
+    for source in all_sources:
+        try:
+            headers = {"User-Agent": "Orchard-CacheResolver/1.0"}
+
+            # Build auth if needed
+            if hasattr(source, 'auth_type'):
+                if source.auth_type == "bearer":
+                    password = source.get_password() if hasattr(source, 'get_password') else getattr(source, 'password', None)
+                    if password:
+                        headers["Authorization"] = f"Bearer {password}"
+                elif source.auth_type == "api_key":
+                    custom_headers = source.get_headers() if hasattr(source, 'get_headers') else {}
+                    if custom_headers:
+                        headers.update(custom_headers)
+
+            auth = None
+            if hasattr(source, 'auth_type') and source.auth_type == "basic":
+                username = getattr(source, 'username', None)
+                if username:
+                    password = source.get_password() if hasattr(source, 'get_password') else getattr(source, 'password', '')
+                    auth = (username, password or '')
+
+            source_url = getattr(source, 'url', '')
+            package_url = source_url.rstrip('/') + f'/simple/{normalized_package}/'
+
+            timeout = httpx.Timeout(connect=30.0, read=60.0)
+
+            with httpx.Client(timeout=timeout, follow_redirects=True) as client:
+                response = client.get(package_url, headers=headers, auth=auth)
+
+                if response.status_code == 404:
+                    last_error = f"Package not found in {getattr(source, 'name', 'source')}"
+                    continue
+
+                if response.status_code != 200:
+                    last_error = f"HTTP {response.status_code} from {getattr(source, 'name', 'source')}"
+                    continue
+
+                # Parse HTML to find the version
+                html = response.text
+                # Look for links containing the version
+                # Pattern: href="...{package}-{version}...#sha256=..."
+                version_pattern = re.escape(resolve_request.version)
+                link_pattern = rf'href="([^"]+{normalized_package}[^"]*{version_pattern}[^"]*)"'
+
+                matches = re.findall(link_pattern, html, re.IGNORECASE)
+
+                if not matches:
+                    # Try with original package name
+                    link_pattern = rf'href="([^"]+{re.escape(resolve_request.package)}[^"]*{version_pattern}[^"]*)"'
+                    matches = re.findall(link_pattern, html, re.IGNORECASE)
+
+                if matches:
+                    # Prefer .tar.gz or .whl files
+                    for match in matches:
+                        url = match.split('#')[0]  # Remove hash fragment
+                        if url.endswith('.tar.gz') or url.endswith('.whl'):
+                            download_url = url
+                            # Extract filename
+                            matched_filename = url.split('/')[-1]
+                            break
+                    if not download_url:
+                        # Use first match
+                        download_url = matches[0].split('#')[0]
+                        matched_filename = download_url.split('/')[-1]
+                    break
+
+                last_error = f"Version {resolve_request.version} not found for {resolve_request.package}"
+
+        except httpx.ConnectError as e:
+            last_error = f"Connection failed: {e}"
+            logger.warning(f"Cache resolve: failed to connect to {getattr(source, 'url', 'source')}: {e}")
+        except httpx.TimeoutException as e:
+            last_error = f"Timeout: {e}"
+            logger.warning(f"Cache resolve: timeout connecting to {getattr(source, 'url', 'source')}: {e}")
+        except Exception as e:
+            last_error = str(e)
+            logger.warning(f"Cache resolve: error: {e}")
+
+    if not download_url:
+        raise HTTPException(
+            status_code=404,
+            detail=f"Could not find {resolve_request.package}=={resolve_request.version}: {last_error}"
+        )
+
+    # Now cache the artifact using the existing cache_artifact logic
+    # Construct a CacheRequest
+    cache_request = CacheRequest(
+        url=download_url,
+        source_type="pypi",
+        package_name=normalized_package,
+        tag=matched_filename or resolve_request.version,
+        user_project=resolve_request.user_project,
+        user_package=resolve_request.user_package,
+        user_tag=resolve_request.user_tag,
+    )
+
+    # Call the cache logic
+    return cache_artifact(
+        request=request,
+        cache_request=cache_request,
+        db=db,
+        storage=storage,
+        current_user=current_user,
+    )
+
+
 # --- Upstream Sources Admin API ---
 
 from .schemas import (

backend/app/schemas.py

@@ -1432,4 +1432,41 @@ class CacheResponse(BaseModel):
     user_reference: Optional[str] = None  # e.g., "my-app/npm-deps:lodash-4.17.21"
 
 
+class CacheResolveRequest(BaseModel):
+    """Request to cache an artifact by package coordinates (no URL required).
+
+    The server will construct the appropriate URL based on source_type and
+    configured upstream sources.
+    """
+    source_type: str
+    package: str
+    version: str
+    user_project: Optional[str] = None
+    user_package: Optional[str] = None
+    user_tag: Optional[str] = None
+
+    @field_validator('source_type')
+    @classmethod
+    def validate_source_type(cls, v: str) -> str:
+        if v not in SOURCE_TYPES:
+            raise ValueError(f"source_type must be one of: {', '.join(SOURCE_TYPES)}")
+        return v
+
+    @field_validator('package')
+    @classmethod
+    def validate_package(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("package cannot be empty")
+        return v
+
+    @field_validator('version')
+    @classmethod
+    def validate_version(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("version cannot be empty")
+        return v
+
+
 

frontend/src/components/Layout.css

@@ -272,7 +272,7 @@
 .footer {
   background: var(--bg-secondary);
   border-top: 1px solid var(--border-primary);
-  padding: 24px 0;
+  padding: 12px 0;
 }
 
 .footer-content {