fix: resolve env path and respect dependency overrides in lifespan

src/interface/api/app.py

@@ -80,7 +80,8 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
         await create_all_tables()
 
     # ── 3. Connect broker (best-effort on startup) ────────────────────────────
-    broker = get_broker()
+    broker_provider = app.dependency_overrides.get(get_broker, get_broker)
+    broker = broker_provider()
     try:
         await broker.connect()
         logger.info("✓ RabbitMQ broker connected.")
@@ -90,7 +91,8 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
         )
 
     # ── 4. Pre-load AI model (best-effort) ────────────────────────────────────
-    model_service = get_model_service()
+    model_provider = app.dependency_overrides.get(get_model_service, get_model_service)
+    model_service = model_provider()
     try:
         await model_service.load_model()
         logger.info("✓ Model service ready: %s", model_service.model_version)

src/shared/config.py

@@ -30,9 +30,14 @@ if "KAGGLE_KERNEL_RUN_TYPE" in os.environ or os.path.exists("/kaggle"):
     except ImportError:
         pass
 
+from pathlib import Path
 from pydantic import Field, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
+# Resolve absolute path to the .env file in the project root
+_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
+_ENV_FILE = _ROOT_DIR / ".env"
+
 
 class Settings(BaseSettings):
     """
@@ -45,7 +50,7 @@ class Settings(BaseSettings):
     """
 
     model_config = SettingsConfigDict(
-        env_file=".env",
+        env_file=str(_ENV_FILE),
         env_file_encoding="utf-8",
         case_sensitive=False,
         extra="ignore",