feat(KIN-012): UI auto/review mode toggle, autopilot indicator, persist project mode in DB

- TaskDetail: hide Approve/Reject buttons in auto mode, show "Автопилот активен" badge
- TaskDetail: execution_mode persisted per-task via PATCH /api/tasks/{id}
- TaskDetail: loadMode reads DB value, falls back to localStorage per project
- TaskDetail: back navigation preserves status filter via ?back_status query param
- ProjectView: toggleMode now persists to DB via PATCH /api/projects/{id}
- ProjectView: loadMode reads project.execution_mode from DB first
- ProjectView: task list shows 🔓 badge for auto-mode tasks
- ProjectView: status filter synced to URL query param ?status=
- api.ts: add patchProject(), execution_mode field on Project interface
- core/db.py, core/models.py: execution_mode columns + migration for projects & tasks
- web/api.py: PATCH /api/projects/{id} and PATCH /api/tasks/{id} support execution_mode
- tests: 256 tests pass, new test_auto_mode.py with 60+ auto mode tests
- frontend: vitest config added for component tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/frontend/src/api.ts

@@ -33,6 +33,7 @@ export interface Project {
   status: string
   priority: number
   tech_stack: string[] | null
+  execution_mode: string | null
   created_at: string
   total_tasks: number
   done_tasks: number
@@ -57,6 +58,7 @@ export interface Task {
   parent_task_id: string | null
   brief: Record<string, unknown> | null
   spec: Record<string, unknown> | null
+  execution_mode: string | null
   created_at: string
   updated_at: string
 }
@@ -158,6 +160,8 @@ export const api = {
     post<AuditResult>(`/projects/${projectId}/audit`, {}),
   auditApply: (projectId: string, taskIds: string[]) =>
     post<{ updated: string[]; count: number }>(`/projects/${projectId}/audit/apply`, { task_ids: taskIds }),
-  patchTask: (id: string, data: { status: string }) =>
+  patchTask: (id: string, data: { status?: string; execution_mode?: string }) =>
     patch<Task>(`/tasks/${id}`, data),
+  patchProject: (id: string, data: { execution_mode: string }) =>
+    patch<Project>(`/projects/${id}`, data),
 }