feat(erase-object): optional high-quality diffusion inpainting bundle (#566)

Adds an opt-in High Quality mode to the Object Eraser, backed by a new inpaint-hq feature bundle (Stable Diffusion 1.5 inpainting via diffusers). The default fast LaMa path is unchanged. Both arch archives are published to deepsafe/feature-bundles and the manifest carries their real sha256/sizes.

Verified end to end: a fresh container pulls the bundle from HuggingFace, checksum-verifies it, extracts torch/diffusers plus the fp16 model, and the HQ sidecar erases a large object with a plausible fill.

Refs #141

tests/integration/tools/image/ai-async-route-coverage.test.ts

@@ -283,7 +283,7 @@ describe("custom async AI image routes", () => {
           expect.stringContaining("subject.png"),
           expect.stringContaining("mask.png"),
         ]),
-        settings: { format: "webp", quality: 72 },
+        settings: { format: "webp", quality: 72, qualityMode: "fast" },
         kind: "ai-tool",
       }),
     );