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/sync_log.py

@@ -0,0 +1,52 @@
+"""
+Sync Log Pydantic schemas.
+"""
+from typing import Optional
+from pydantic import BaseModel, Field
+
+
+class SyncLogResponse(BaseModel):
+    """
+    Schema for sync log response.
+    """
+    id: int = Field(description="Sync log ID")
+    repo_id: int = Field(description="Repository ID")
+    status: str = Field(description="Sync status")
+    started_at: int = Field(description="Sync start timestamp (Unix timestamp)")
+    finished_at: int = Field(description="Sync finish timestamp (Unix timestamp)")
+    commits_count: Optional[int] = Field(
+        default=None,
+        description="Number of commits synced"
+    )
+    error_msg: Optional[str] = Field(
+        default=None,
+        description="Error message if sync failed"
+    )
+    created_at: int = Field(description="Creation timestamp (Unix timestamp)")
+
+    model_config = {
+        "json_schema_extra": {
+            "examples": [
+                {
+                    "id": 1,
+                    "repo_id": 1,
+                    "status": "success",
+                    "started_at": 1711891200,
+                    "finished_at": 1711891500,
+                    "commits_count": 5,
+                    "error_msg": None,
+                    "created_at": 1711891200
+                },
+                {
+                    "id": 2,
+                    "repo_id": 1,
+                    "status": "error",
+                    "started_at": 1711891800,
+                    "finished_at": 1711892000,
+                    "commits_count": None,
+                    "error_msg": "Connection timeout",
+                    "created_at": 1711891800
+                }
+            ]
+        }
+    }