feat: persist template/batch-mode, per-aspect resets, de-dup template actions

§17.1 Preferences persistence:
- Wire the previously-unused config_service; remember and restore the
  last-selected template and last batch mode. main_window loads config,
  distributes initial values, then persists on change (save-on-change).
- template_panel: template_changed signal, select_template,
  current_template_state. queue_panel: set_batch_mode + batch_mode_changed.

§17.2 Independent resets:
- Replace the combined reset and 归零 with per-section 位置/尺寸/旋转 reset
  buttons (quiet ghost styling) that restore only their own aspect to the
  selected template. Size reset changes width/height only, leaving X/Y.

Button de-dup:
- Remove the export panel's 应用为模板 / 重置为模板 — literal duplicates of
  the template panel's 另存为 / 重置为模板. Template actions now live only
  in the template area; the export panel handles output only.

Docs: PRD (6.6/6.9/9/10), architecture (4.12), UI design (7.x/10),
development-rules (6, single-home actions + consistent naming), tasks.md (17).

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

docs/05-project-architecture.md

@@ -240,11 +240,15 @@ BatchResult
 - 读取和保存应用配置。
 - 管理默认配置。
 - 在配置损坏或缺失时提供安全默认值。
+- 持久化用户偏好：输出设置、上次选择的模板（`last_template`）、上次选择的批量模式（`last_batch_mode`）等。
+
+由主窗口集中使用：启动时加载一次并把初值分发给各面板，面板选择变化时「改一次存一次」回写。各 UI 控件不直接读写配置文件，避免分散解析。
 
 禁止：
 
 - 禁止在多个模块中重复解析同一个配置文件。
 - 禁止启动时无提示清空用户配置。
+- 禁止 UI 控件绕过本服务直接读写配置文件。
 
 ### 4.13 `services/template_service.py`