feat: add fee workspace and polish AI presentation

.trellis/tasks/07-09-ai-fee-frontend/task.json

@@ -0,0 +1,26 @@
+{
+  "id": "ai-fee-frontend",
+  "name": "ai-fee-frontend",
+  "title": "梳理 AI 功能并补齐费用前端",
+  "description": "",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "TalexDreamSoul",
+  "assignee": "TalexDreamSoul",
+  "createdAt": "2026-07-09",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}