Allow heading tags (h1-h6) in ContentSanitizer so news editor headings render

services/enhance-worker/app/upscaler.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+from .config import Settings
+from .engines.base import EngineHealth, UpscaleEngine, UpscaleEngineUnavailable, UpscaleResult
+from .engines.pillow_engine import PillowUpscaleEngine
+from .engines.realesrgan_ncnn_engine import RealEsrganNcnnEngine
+from .image_io import DownloadedImage
+
+
+class UnavailableEngine(UpscaleEngine):
+    def __init__(self, settings: Settings, engine_name: str) -> None:
+        self.settings = settings
+        self.engine_name = engine_name
+
+    def health(self) -> EngineHealth:
+        return EngineHealth(
+            status="degraded",
+            engine=self.engine_name,
+            device=self.settings.device,
+            models_loaded=False,
+        )
+
+    def upscale(self, downloaded: DownloadedImage, scale: int, mode: str, output_format: str) -> UpscaleResult:
+        raise UpscaleEngineUnavailable("Upscale engine is not available. Check model files and worker installation.")
+
+
+def build_upscaler(settings: Settings) -> UpscaleEngine:
+    engine_name = settings.engine.strip().lower()
+
+    if engine_name == "pillow":
+        return PillowUpscaleEngine(settings)
+
+    if engine_name in {"realesrgan", "realesrgan-ncnn"}:
+        return RealEsrganNcnnEngine(settings)
+
+    return UnavailableEngine(settings, engine_name or "unknown")