Add web UI with artifact table and upload functionality

Features:
- Modern web interface with table view of all artifacts
- Display all metadata: filename, type, size, test info, tags
- Upload form with full metadata support
- Query/filter interface
- Detail modal for viewing full artifact information
- Download and delete actions
- Integrated seed data generation via UI
- Responsive design with gradient theme

Technical:
- Pure HTML/CSS/JavaScript (no frameworks)
- FastAPI serves static files
- Seed data API endpoint for easy testing
- Pagination support
- Real-time deployment mode display

The UI is now accessible at http://localhost:8000/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/main.py

@@ -1,9 +1,13 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
 from app.api.artifacts import router as artifacts_router
+from app.api.seed import router as seed_router
 from app.database import init_db
 from app.config import settings
 import logging
+import os
 
 # Configure logging
 logging.basicConfig(
@@ -33,6 +37,12 @@ app.add_middleware(
 
 # Include routers
 app.include_router(artifacts_router)
+app.include_router(seed_router)
+
+# Mount static files
+static_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), "static")
+if os.path.exists(static_dir):
+    app.mount("/static", StaticFiles(directory=static_dir), name="static")
 
 
 @app.on_event("startup")
@@ -45,9 +55,9 @@ async def startup_event():
     logger.info("Application started successfully")
 
 
-@app.get("/")
-async def root():
-    """Root endpoint"""
+@app.get("/api")
+async def api_root():
+    """API root endpoint"""
     return {
         "message": "Test Artifact Data Lake API",
         "version": "1.0.0",
@@ -57,6 +67,23 @@ async def root():
     }
 
 
+@app.get("/")
+async def ui_root():
+    """Serve the UI"""
+    index_path = os.path.join(static_dir, "index.html")
+    if os.path.exists(index_path):
+        return FileResponse(index_path)
+    else:
+        return {
+            "message": "Test Artifact Data Lake API",
+            "version": "1.0.0",
+            "docs": "/docs",
+            "ui": "UI not found. Serving API only.",
+            "deployment_mode": settings.deployment_mode,
+            "storage_backend": settings.storage_backend
+        }
+
+
 @app.get("/health")
 async def health_check():
     """Health check endpoint"""