fix: explicit environment variable loading for HF secrets

main.py

@@ -19,24 +19,31 @@ async def health():
     return {"status": "ok", "message": "Weatherhack API is live"}
 
 
+import os
+from pydantic import Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
-    weatherstack_access_key: str = "test"
+    weatherstack_access_key: str = Field("test", alias="WEATHERSTACK_ACCESS_KEY")
 
     model_config = SettingsConfigDict(
         env_file=".env",
         extra="ignore",
-        env_prefix="",  # Ensure it picks up bare env vars
     )
 
 
 settings = Settings()
 
-# Debug log for key loading (masked)
+# Full debug for HF environment
+if "WEATHERSTACK_ACCESS_KEY" in os.environ:
+    env_val = os.environ["WEATHERSTACK_ACCESS_KEY"]
+    print(f"DEBUG: Found in os.environ. Length: {len(env_val)}")
+else:
+    print("DEBUG: NOT found in os.environ")
+
 print(
-    f"DEBUG: Key loaded: {settings.weatherstack_access_key[:4]}...{settings.weatherstack_access_key[-4:]}"
+    f"DEBUG: Settings value: {settings.weatherstack_access_key[:4]}...{settings.weatherstack_access_key[-4:]}"
 )