fix(init): add missing /api/lm/init-status endpoint used by polling fallback

initialization.js falls back to polling /api/lm/init-status when the
/ws/init-progress WebSocket cannot be established, but no route ever
registered that path — each poll 404'd and the page never reloaded after
the scan completed. Report the aggregate status of all four scanners and
omit pageType so every initialization page accepts the update.

py/routes/handlers/misc_handlers.py

@@ -649,9 +649,60 @@ class NodeRegistry:
 
 
 class HealthCheckHandler:
+    def __init__(
+        self,
+        scanner_getters: Mapping[str, Callable[[], Awaitable[Any]]] | None = None,
+    ) -> None:
+        self._scanner_getters = scanner_getters or {
+            "lora": ServiceRegistry.get_lora_scanner,
+            "checkpoint": ServiceRegistry.get_checkpoint_scanner,
+            "embedding": ServiceRegistry.get_embedding_scanner,
+            "recipe": ServiceRegistry.get_recipe_scanner,
+        }
+
     async def health_check(self, request: web.Request) -> web.Response:
         return web.json_response({"status": "ok"})
 
+    async def get_init_status(self, request: web.Request) -> web.Response:
+        """Report aggregate scanner initialization status.
+
+        Used by the initialization page's polling fallback when the
+        /ws/init-progress WebSocket is unavailable. Omits pageType so every
+        page accepts the update and only reloads once all scanners are done.
+        """
+        pending: list[str] = []
+        for name, getter in self._scanner_getters.items():
+            try:
+                scanner = await getter()
+            except Exception:
+                pending.append(name)
+                continue
+            cache_ready = getattr(scanner, "_cache", None) is not None
+            is_initializing = getattr(scanner, "is_initializing", None)
+            busy = (
+                is_initializing()
+                if callable(is_initializing)
+                else bool(getattr(scanner, "_is_initializing", False))
+            )
+            if busy or not cache_ready:
+                pending.append(name)
+
+        if pending:
+            return web.json_response(
+                {
+                    "status": "initializing",
+                    "stage": "processing",
+                    "details": "Initializing: " + ", ".join(pending),
+                }
+            )
+        return web.json_response(
+            {
+                "status": "complete",
+                "progress": 100,
+                "details": "Initialization complete",
+            }
+        )
+
 
 class SupportersHandler:
     """Handler for supporters data."""
@@ -3859,6 +3910,7 @@ class MiscHandlerSet:
     ) -> Mapping[str, Callable[[web.Request], Awaitable[web.StreamResponse]]]:
         return {
             "health_check": self.health.health_check,
+            "get_init_status": self.health.get_init_status,
             "get_settings": self.settings.get_settings,
             "update_settings": self.settings.update_settings,
             "get_doctor_diagnostics": self.doctor.get_doctor_diagnostics,