feat: 项目 logo + 侧栏拖动排序 + 合并修复(主检出干净时 in-place)

- 项目 logo：仓库内文件(logo/icon/favicon 等多路径)→git remote 头像→自定义(URL/相对路径)→
  首字母徽章兜底；GET /api/projects/:id/logo(文件流/302)，配置面板加 Logo 输入
- 侧栏项目拖动排序：projects.sort_order + POST /api/projects/reorder，乐观更新
- 合并修复：默认分支正被主检出占用时，若工作区干净则直接在主检出 in-place 合并
  (用户手动合并的等价操作，安全)；脏工作区拒绝并提示提交/暂存或仅通过
- schema: projects.logo / sort_order(ensureColumn 平滑迁移)

测试 75/75(merge 用例改为干净→成功/脏→拒绝)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/store/mappers.ts

@@ -8,7 +8,7 @@ export interface ProjectRow {
   id: string; name: string; repo_path: string; default_branch: string;
   verify_cmd: string | null; autonomy: string; model: string | null;
   concurrency: number; status: string; created_at: string;
-  last_sync_at: string | null;
+  last_sync_at: string | null; logo: string | null; sort_order: number;
 }
 export interface TaskRow {
   id: string; project_id: string; parent_id: string | null; depth: number;
@@ -35,7 +35,7 @@ export function rowToProject(r: ProjectRow): Project {
     id: r.id, name: r.name, repoPath: r.repo_path, defaultBranch: r.default_branch,
     verifyCmd: r.verify_cmd, autonomy: r.autonomy as Autonomy, model: r.model,
     concurrency: r.concurrency, status: r.status as Project['status'], createdAt: r.created_at,
-    lastSyncAt: r.last_sync_at,
+    lastSyncAt: r.last_sync_at, logo: r.logo, sortOrder: r.sort_order,
   };
 }