feat: complete Git Repo Manager MVP implementation

Backend (Phase 1-6):
- Pydantic schemas for request/response validation
- Service layer (SSH Key, Server, Repo, Sync)
- API routes with authentication
- FastAPI main application with lifespan management
- ORM models (SshKey, Server, Repo, SyncLog)

Frontend (Phase 7):
- Vue 3 + Element Plus + Pinia + Vue Router
- API client with Axios and interceptors
- State management stores
- All page components (Dashboard, Servers, Repos, SyncLogs, SshKeys, Settings)

Deployment (Phase 8):
- README with quick start guide
- Startup script (start.sh)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/schemas/repo.py

@@ -0,0 +1,64 @@
+"""
+Repository Pydantic schemas.
+"""
+from typing import Optional
+from pydantic import BaseModel, Field
+
+
+class CommitInfo(BaseModel):
+    """
+    Schema for commit information.
+    """
+    hash: str = Field(description="Commit hash")
+    author: str = Field(description="Commit author")
+    message: str = Field(description="Commit message")
+    timestamp: int = Field(description="Commit timestamp (Unix timestamp)")
+
+    model_config = {
+        "json_schema_extra": {
+            "examples": [
+                {
+                    "hash": "a1b2c3d4e5f6...",
+                    "author": "John Doe <john@example.com>",
+                    "message": "Add new feature",
+                    "timestamp": 1711891200
+                }
+            ]
+        }
+    }
+
+
+class RepoResponse(BaseModel):
+    """
+    Schema for repository response.
+    """
+    id: int = Field(description="Repository ID")
+    server_id: int = Field(description="Server ID")
+    name: str = Field(description="Repository name")
+    full_name: str = Field(description="Repository full name (e.g., 'owner/repo')")
+    clone_url: str = Field(description="Git clone URL")
+    local_path: str = Field(description="Local storage path")
+    last_sync_at: Optional[int] = Field(
+        default=None,
+        description="Last sync timestamp (Unix timestamp)"
+    )
+    status: str = Field(description="Repository status")
+    created_at: int = Field(description="Creation timestamp (Unix timestamp)")
+
+    model_config = {
+        "json_schema_extra": {
+            "examples": [
+                {
+                    "id": 1,
+                    "server_id": 1,
+                    "name": "my-repo",
+                    "full_name": "myorg/my-repo",
+                    "clone_url": "https://gitea.example.com/myorg/my-repo.git",
+                    "local_path": "/data/gitea-mirror/myorg/my-repo",
+                    "last_sync_at": 1711891200,
+                    "status": "success",
+                    "created_at": 1711804800
+                }
+            ]
+        }
+    }