refactor: move business logic to service layer for architecture compliance

- images.py: delegate file validation (size, type, extension) to image_service
- platform_health.py: extract all database queries to platform_health_service
- Fixes 13 architecture validation errors (API-002, API-003)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/api/v1/admin/images.py

@@ -10,7 +10,7 @@ Provides:
 
 import logging
 
-from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile
+from fastapi import APIRouter, Depends, File, Form, UploadFile
 
 from app.api.deps import get_current_admin_api
 from app.services.image_service import image_service
@@ -24,9 +24,6 @@ from models.schema.image import (
 router = APIRouter(prefix="/images")
 logger = logging.getLogger(__name__)
 
-# Maximum upload size (10MB)
-MAX_UPLOAD_SIZE = 10 * 1024 * 1024
-
 
 @router.post("/upload", response_model=ImageUploadResponse)
 async def upload_image(
@@ -50,40 +47,21 @@ async def upload_image(
     Returns:
         Image URLs and metadata
     """
-    # Validate file size
+    # Read file content
     content = await file.read()
-    if len(content) > MAX_UPLOAD_SIZE:
-        raise HTTPException(
-            status_code=413,
-            detail=f"File too large. Maximum size: {MAX_UPLOAD_SIZE // (1024*1024)}MB",
-        )
 
-    # Validate content type
-    if not file.content_type or not file.content_type.startswith("image/"):
-        raise HTTPException(
-            status_code=400,
-            detail="Invalid file type. Only images are allowed.",
-        )
+    # Delegate all validation and processing to service
+    result = image_service.upload_product_image(
+        file_content=content,
+        filename=file.filename or "image.jpg",
+        content_type=file.content_type,
+        vendor_id=vendor_id,
+        product_id=product_id,
+    )
 
-    try:
-        result = image_service.upload_product_image(
-            file_content=content,
-            filename=file.filename or "image.jpg",
-            vendor_id=vendor_id,
-            product_id=product_id,
-        )
+    logger.info(f"Image uploaded: {result['id']} for vendor {vendor_id}")
 
-        logger.info(f"Image uploaded: {result['id']} for vendor {vendor_id}")
-
-        return ImageUploadResponse(success=True, image=result)
-
-    except ValueError as e:
-        logger.warning(f"Image upload failed: {e}")
-        return ImageUploadResponse(success=False, error=str(e))
-
-    except Exception as e:
-        logger.error(f"Image upload error: {e}")
-        raise HTTPException(status_code=500, detail="Failed to process image")
+    return ImageUploadResponse(success=True, image=result)
 
 
 @router.delete("/{image_hash}", response_model=ImageDeleteResponse)