refactor(backend): bulletproof imports for cloud deployment environment

backend/main.py

@@ -1,8 +1,20 @@
+import sys
+import os
+
+# Add backend directory to sys.path to resolve imports in both Docker and Local runs
+BACKEND_DIR = os.path.dirname(os.path.abspath(__file__))
+if BACKEND_DIR not in sys.path:
+    sys.path.append(BACKEND_DIR)
+
+try:
+    from .model_loader import SignModel
+except (ImportError, ValueError):
+    from model_loader import SignModel
+
 from fastapi import FastAPI, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 from typing import List, Optional
-from model_loader import SignModel
 
 app = FastAPI(title="SignBridge API", version="1.0.0")
 

backend/model_loader.py

@@ -8,7 +8,10 @@ CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
 if CURRENT_DIR not in sys.path:
     sys.path.append(CURRENT_DIR)
 
-from sign_bridge_inference import SignBridgeInference
+try:
+    from .sign_bridge_inference import SignBridgeInference
+except (ImportError, ValueError):
+    from sign_bridge_inference import SignBridgeInference
 
 # For Hugging Face Spaces / Docker, we'll store weights in a local weights directory
 MODEL_ROOT = os.path.join(os.path.dirname(CURRENT_DIR), "weights")

backend/verify_api.py

@@ -1,10 +1,16 @@
 import sys
 import os
-# Add current directory to path
-sys.path.append(os.getcwd())
+# Add backend directory to sys.path to resolve imports in both Docker and Local runs
+BACKEND_DIR = os.path.dirname(os.path.abspath(__file__))
+if BACKEND_DIR not in sys.path:
+    sys.path.append(BACKEND_DIR)
+
+try:
+    from .main import app
+except (ImportError, ValueError):
+    from main import app
 
 from fastapi.testclient import TestClient
-from main import app
 
 client = TestClient(app)