Add SwarmUI settings management and portrait generation enhancements

- Introduced new API endpoints for managing SwarmUI settings, including fetching and saving presets and age rules.
- Updated the portrait generation logic to utilize the new settings structure, allowing for dynamic preset selection based on age.
- Enhanced UI components to support SwarmUI settings, including localization for new strings and improved styling for settings sections.
- Added tests to verify the functionality of new settings endpoints and portrait generation behavior.

This commit lays the groundwork for more flexible and user-friendly portrait generation options.

docs/protocol.md

@@ -389,13 +389,32 @@ is `404` `unknown-school`; unknown person is `404` `unknown-person`. Invalid `ki
   "kind": "avatar",
   "positive": "cinematic photo, …, close up, head and shoulders portrait, …, age 12, …",
   "negative": "(low quality, worst quality:1.4), …",
-  "promptExtra": null
+  "promptExtra": null,
+  "presetId": "default",
+  "presetLabel": "Default"
 }
 ```
 
 `GET /api/status` includes `swarmUiConfigured` and `swarmUiConnected` (`null` when not configured)
 so the client can disable generate buttons and show reachability without trying POST first.
 
+### `GET /api/settings/swarmui`
+
+Returns the editable SwarmUI preset file (`swarmui.json`): named presets (model, steps, sampler,
+LoRA lists, per-kind sizes/prompts), `activePresetId` and `ageRules` mapping age bands to presets.
+Portrait generation resolves the preset from the person's age before building the prompt.
+
+### `PUT /api/settings/swarmui`
+
+Replaces the preset file after validation. Invalid preset ids, age rules or numeric ranges return
+`400` `invalid-body`. Changes apply immediately to new portrait generations.
+
+### `GET /api/settings/swarmui/discovery`
+
+When SwarmUI is configured and reachable, proxies `ListT2IParams` and returns
+`{ connected, models, loras, samplers, schedulers }` for the settings UI comboboxes. When SwarmUI
+is off or unreachable, `connected` is false and the lists are empty.
+
 ### `GET /api/schools/{id}/dress-rules`
 
 Student and staff dress-code pairs for the school. Unknown `{id}` is `404` `unknown-school`.