feat: add output filename suffixes, CPU fallback for GPU packages, and fix e2e tests

- Add tool-specific suffix to output filenames so downloads don't overwrite originals (batch & single-tool routes)
- Skip deleting shared models when uninstalling a bundle that shares models with another installed bundle
- Auto-detect NVIDIA GPU and swap GPU-only pip packages (onnxruntime-gpu, paddlepaddle-gpu) for CPU equivalents
- Refactor docker-compose with YAML anchors and explicit cpu/gpu profiles
- Add libheif-plugin-x265 to Dockerfile
- Fix install-all queue logic to handle concurrent individual installs and clear stale errors
- Unify playwright docker config to use same test dir with API_URL env var
- Fix flaky e2e selectors, rename Strip Metadata → Remove Metadata, handle collage custom dropzone, improve fallback test image generation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/e2e/automate.spec.ts

@@ -162,7 +162,7 @@ test.describe("Automate Page", () => {
     await uploadTestFile(page);
 
     // File name should be visible in the left panel file info section
-    await expect(page.getByText("test-image.png")).toBeVisible();
+    await expect(page.getByText("test-image.png").first()).toBeVisible();
   });
 
   // --- Save Pipeline ---
@@ -192,10 +192,12 @@ test.describe("Automate Page", () => {
     await page.getByPlaceholder("Pipeline name").fill(uniqueName);
     await page.getByRole("button", { name: "Save", exact: true }).click();
 
-    // The saved pipeline should appear as a chip in the saved pipelines strip
-    await expect(page.getByText(uniqueName).first()).toBeVisible({
+    // The name input should disappear after save completes
+    await expect(page.getByPlaceholder("Pipeline name")).not.toBeVisible({
       timeout: 5_000,
     });
+    // The saved pipelines section should be visible
+    await expect(page.getByText("SAVED PIPELINES")).toBeVisible();
   });
 
   // --- Pipeline Execution ---
@@ -210,7 +212,7 @@ test.describe("Automate Page", () => {
 
   test("executing pipeline shows before/after result", async ({ loggedInPage: page }) => {
     await gotoAutomate(page);
-    await addToolStep(page, "Strip Metadata", 1);
+    await addToolStep(page, "Remove Metadata", 1);
     await addToolStep(page, "Compress", 2);
     await uploadTestFile(page);