Add site banner, build number, and changelog

backend/app/routers/site.py

@@ -0,0 +1,39 @@
+from typing import Any, Dict
+
+from fastapi import APIRouter, Depends
+
+from ..auth import get_current_user
+from ..runtime import get_runtime_settings
+
+router = APIRouter(prefix="/site", tags=["site"])
+
+_BANNER_TONES = {"info", "warning", "error", "maintenance"}
+
+
+def _build_site_info(include_changelog: bool) -> Dict[str, Any]:
+    runtime = get_runtime_settings()
+    banner_message = (runtime.site_banner_message or "").strip()
+    tone = (runtime.site_banner_tone or "info").strip().lower()
+    if tone not in _BANNER_TONES:
+        tone = "info"
+    info = {
+        "buildNumber": (runtime.site_build_number or "").strip(),
+        "banner": {
+            "enabled": bool(runtime.site_banner_enabled and banner_message),
+            "message": banner_message,
+            "tone": tone,
+        },
+    }
+    if include_changelog:
+        info["changelog"] = (runtime.site_changelog or "").strip()
+    return info
+
+
+@router.get("/public")
+async def site_public() -> Dict[str, Any]:
+    return _build_site_info(False)
+
+
+@router.get("/info")
+async def site_info(user: Dict[str, Any] = Depends(get_current_user)) -> Dict[str, Any]:
+    return _build_site_info(True)