feat(settings): replicate the WorkBuddy personalization panel and wire identity, tone and prompts (TODO 13)

Recover the WorkBuddy 5.8.3 个性化 page from REA evidence (PersonalizationPanel-D16rRGjy.css + tokens): 45 module rules plus scoped light/dark tokens, the five-card 1160px layout (identity card 638x100 with inline editors, reply preference card 638x204, three 638x264 long-text cards with 598x160 previews) and the 640x520 editor modal.

Persist identity, tone, welcome tips, custom instructions, persona and long-term memory in config.json, expose personalization:get/update over IPC, and append the resulting personalization context to each turn's prompt for both the OMP and built-in kernels. Wire 欢迎语 to the streaming loading tips and keep 显示文件修改过程 visibly disabled because YCode has no incremental file-change renderer yet.

Verify with scripts/verify-personalization-settings.cjs: 29 assertions covering geometry, tone options, switches, inline identity editing with blur-discard, editor modal save/cancel, config persistence, reopen, dark surfaces and no renderer errors. Add a pure prompt-builder regression and keep every existing settings regression green.

scripts/rea/probe-todo13-personalization-scroll.json

@@ -0,0 +1,17 @@
+{
+  "include_fonts": false,
+  "include_message_content": false,
+  "track_selectors": [
+    ".settings-modal__panel",
+    ".general-settings-panel.personalization-panel",
+    ".general-settings-panel__group",
+    ".local-memory-long-card"
+  ],
+  "actions": [
+    { "kind": "wait", "step_id": "personalization-top", "duration_ms": 250, "frames": 1 },
+    { "kind": "scroll", "step_id": "personalization-scroll-1", "selector": ".settings-modal__panel", "delta_y": 300, "frames": 1 },
+    { "kind": "scroll", "step_id": "personalization-scroll-2", "selector": ".settings-modal__panel", "delta_y": 300, "frames": 1 },
+    { "kind": "scroll", "step_id": "personalization-scroll-3-bottom", "selector": ".settings-modal__panel", "delta_y": 300, "frames": 1 },
+    { "kind": "scroll", "step_id": "personalization-return-top", "selector": ".settings-modal__panel", "delta_y": -1200, "frames": 1 }
+  ]
+}