Merge origin/main into feature/upload-download-apis

Resolved conflicts in:
- backend/app/routes.py: Combined imports (Query, Header, Response) and schemas (pagination + resumable upload)
- backend/app/schemas.py: Kept all schemas (pagination + resumable upload)

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

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

backend/app/schemas.py

@@ -1,8 +1,23 @@
 from datetime import datetime
-from typing import Optional, List, Dict, Any
+from typing import Optional, List, Dict, Any, Generic, TypeVar
 from pydantic import BaseModel
 from uuid import UUID
 
+T = TypeVar("T")
+
+
+# Pagination schemas
+class PaginationMeta(BaseModel):
+    page: int
+    limit: int
+    total: int
+    total_pages: int
+
+
+class PaginatedResponse(BaseModel, Generic[T]):
+    items: List[T]
+    pagination: PaginationMeta
+
 
 # Project schemas
 class ProjectCreate(BaseModel):