feat: Add initial backend application and update Dockerfile for its setup.

backend/app/main.py

@@ -9,6 +9,9 @@ from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, WebSocket, WebSocketDisconnect
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
+import os
 
 from app.config import settings
 from app.database import init_db
@@ -62,6 +65,23 @@ app.include_router(logs.router)
 app.include_router(workflows.router)
 app.include_router(config.router)
 
+# ─── Static Files ─────────────────────────────────────────────────────────────
+
+if os.path.exists("static"):
+    app.mount("/assets", StaticFiles(directory="static/assets"), name="assets")
+    
+    @app.get("/{full_path:path}")
+    async def serve_spa(full_path: str):
+        # API requests should already be handled by routers
+        # If not an API request, serve index.html
+        if full_path.startswith("api/") or full_path.startswith("ws/"):
+            return None # Should not happen due to router order
+        
+        index_path = os.path.join("static", "index.html")
+        if os.path.exists(index_path):
+            return FileResponse(index_path)
+        return {"detail": "Frontend not found"}
+
 
 # ─── WebSocket ─────────────────────────────────────────────────────────────────