chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/coordinator-api/src/app/deps.py

@@ -0,0 +1,26 @@
+from typing import Callable
+from fastapi import Depends, Header, HTTPException
+
+from .config import settings
+
+
+class APIKeyValidator:
+    def __init__(self, allowed_keys: list[str]):
+        self.allowed_keys = {key.strip() for key in allowed_keys if key}
+
+    def __call__(self, api_key: str | None = Header(default=None, alias="X-Api-Key")) -> str:
+        if not api_key or api_key not in self.allowed_keys:
+            raise HTTPException(status_code=401, detail="invalid api key")
+        return api_key
+
+
+def require_client_key() -> Callable[[str | None], str]:
+    return APIKeyValidator(settings.client_api_keys)
+
+
+def require_miner_key() -> Callable[[str | None], str]:
+    return APIKeyValidator(settings.miner_api_keys)
+
+
+def require_admin_key() -> Callable[[str | None], str]:
+    return APIKeyValidator(settings.admin_api_keys)