feat: adapt image tuning by engine

progress.md

@@ -295,6 +295,27 @@
   - Local HTTP smoke test uploaded a PNG through `/api/v1/assets`, fetched `/api/v1/assets/:id`, and downloaded matching binary bytes from `/api/v1/assets/:id/download`.
   - Mock-provider task flow created a queued job through `/api/v1/jobs`, Worker processed it to `succeeded`, generated output asset carried the API client tag, and download returned an attachment response.
 
+## Session: 2026-05-29 - Engine-Aware Image Tuning
+
+### Implementation
+- **Status:** complete
+- Actions taken:
+  - Replaced the image generation text-influence range slider with select options.
+  - Added create-page engine detection from `/api/health`.
+  - For Jimeng image generation, the UI now shows `文本影响` options: `创意 35`, `均衡 50`, `贴合 70`, `严格 85`, and submits `scale`.
+  - For EvoLink image generation, the UI now shows `生成质量` options: `快速`, `标准`, `精细`, and submits `quality`.
+  - Added per-request EvoLink `quality` support in the payload builder.
+  - Updated public API request typing, OpenAPI schema, API docs, and focused tests.
+
+### Verification
+- **Status:** complete
+- Results:
+  - `npm test`: 7 files / 22 tests passed.
+  - `npm run build`: production build succeeded.
+  - Agent-browser snapshot on `/create` showed current EvoLink mode rendering `生成质量` with `快速 / 标准 / 精细`.
+  - Desktop and mobile screenshots showed the create-page controls fitting cleanly.
+  - Browser page errors list was empty.
+
 ## Error Log - Server Deployment Support
 | Timestamp | Error | Attempt | Resolution |
 |-----------|-------|---------|------------|