Rewrite from Go + vanilla JS to Python (FastAPI) + React (TypeScript)

- Backend: Python 3.12 with FastAPI, SQLAlchemy, boto3
- Frontend: React 18 with TypeScript, Vite build tooling
- Updated Dockerfile for multi-stage Node + Python build
- Updated CI pipeline for Python backend
- Removed old Go code (cmd/, internal/, go.mod, go.sum)
- Updated README with new tech stack documentation

backend/app/schemas.py

@@ -0,0 +1,101 @@
+from datetime import datetime
+from typing import Optional, List
+from pydantic import BaseModel
+from uuid import UUID
+
+
+# Grove schemas
+class GroveCreate(BaseModel):
+    name: str
+    description: Optional[str] = None
+    is_public: bool = True
+
+
+class GroveResponse(BaseModel):
+    id: UUID
+    name: str
+    description: Optional[str]
+    is_public: bool
+    created_at: datetime
+    updated_at: datetime
+    created_by: str
+
+    class Config:
+        from_attributes = True
+
+
+# Tree schemas
+class TreeCreate(BaseModel):
+    name: str
+    description: Optional[str] = None
+
+
+class TreeResponse(BaseModel):
+    id: UUID
+    grove_id: UUID
+    name: str
+    description: Optional[str]
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Fruit schemas
+class FruitResponse(BaseModel):
+    id: str
+    size: int
+    content_type: Optional[str]
+    original_name: Optional[str]
+    created_at: datetime
+    created_by: str
+    ref_count: int
+
+    class Config:
+        from_attributes = True
+
+
+# Graft schemas
+class GraftCreate(BaseModel):
+    name: str
+    fruit_id: str
+
+
+class GraftResponse(BaseModel):
+    id: UUID
+    tree_id: UUID
+    name: str
+    fruit_id: str
+    created_at: datetime
+    created_by: str
+
+    class Config:
+        from_attributes = True
+
+
+# Cultivate response (upload)
+class CultivateResponse(BaseModel):
+    fruit_id: str
+    size: int
+    grove: str
+    tree: str
+    tag: Optional[str]
+
+
+# Consumer schemas
+class ConsumerResponse(BaseModel):
+    id: UUID
+    tree_id: UUID
+    project_url: str
+    last_access: datetime
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Health check
+class HealthResponse(BaseModel):
+    status: str
+    version: str = "1.0.0"