Complete audit history API: update endpoints, download logging, and history models (#20)

- Add PUT /api/v1/projects/{project} endpoint with audit logging
- Add PUT /api/v1/project/{project}/packages/{package} endpoint with audit logging
- Add artifact.download audit logging to download endpoint
- Enhance tag history endpoint with artifact metadata and pagination
- Add ProjectHistory and PackageHistory models for metadata change tracking
- Add database triggers for automatic history population on updates
- Add migration 004_history_tables.sql with tables and triggers

backend/app/schemas.py

@@ -40,6 +40,13 @@ class ProjectResponse(BaseModel):
         from_attributes = True
 
 
+class ProjectUpdate(BaseModel):
+    """Schema for updating a project"""
+
+    description: Optional[str] = None
+    is_public: Optional[bool] = None
+
+
 # Package format and platform enums
 PACKAGE_FORMATS = [
     "generic",
@@ -87,6 +94,14 @@ class PackageResponse(BaseModel):
         from_attributes = True
 
 
+class PackageUpdate(BaseModel):
+    """Schema for updating a package"""
+
+    description: Optional[str] = None
+    format: Optional[str] = None
+    platform: Optional[str] = None
+
+
 class TagSummary(BaseModel):
     """Lightweight tag info for embedding in package responses"""