fix: resolve architecture validation errors and warnings

- Move database operations from API to service layer:
  - Add create_pending_scan() method to code_quality_service
  - Add get_running_scans() method to code_quality_service
  - Update API to use service methods instead of direct db queries
- Replace inline SVG spinner with $icon('spinner', ...) helper
- Add comment documenting custom dropdown exception

Validation now passes with 0 errors.

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

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

app/services/code_quality_service.py

@@ -229,6 +229,44 @@ class CodeQualityService:
         """Get scan by ID"""
         return db.query(ArchitectureScan).filter(ArchitectureScan.id == scan_id).first()
 
+    def create_pending_scan(
+        self, db: Session, validator_type: str, triggered_by: str
+    ) -> ArchitectureScan:
+        """
+        Create a new scan record with pending status.
+
+        Args:
+            db: Database session
+            validator_type: Type of validator (architecture, security, performance)
+            triggered_by: Who triggered the scan (e.g., "manual:username")
+
+        Returns:
+            The created ArchitectureScan record with ID populated
+        """
+        scan = ArchitectureScan(
+            timestamp=datetime.now(UTC),
+            validator_type=validator_type,
+            status="pending",
+            triggered_by=triggered_by,
+        )
+        db.add(scan)
+        db.flush()  # Get scan.id
+        return scan
+
+    def get_running_scans(self, db: Session) -> list[ArchitectureScan]:
+        """
+        Get all currently running scans (pending or running status).
+
+        Returns:
+            List of scans with status 'pending' or 'running', newest first
+        """
+        return (
+            db.query(ArchitectureScan)
+            .filter(ArchitectureScan.status.in_(["pending", "running"]))
+            .order_by(ArchitectureScan.timestamp.desc())
+            .all()
+        )
+
     def get_scan_history(
         self, db: Session, limit: int = 30, validator_type: str = None
     ) -> list[ArchitectureScan]: