refactor(app.py): 抽出 /api/categories CRUD 至 category_routes Blueprint

- 新增 routes/category_routes.py（46 行，3 routes：POST/PUT/DELETE）
- app.py 7053 → 7012（-41 行）
- 沿用 services.json_storage.load_categories/save_categories
- 註冊位置貼齊 system_bp 後方

Phase 3e route handlers Blueprint 化首棒，邊界最小、無共用狀態

app.py

@@ -317,6 +317,10 @@ app.register_blueprint(system_bp)
 csrf.exempt(system_bp)  # n8n API 需要豁免 CSRF
 sys_log.info("[Blueprint] ✅ 系統管理 Blueprint 已註冊 (CSRF 已豁免)")
 
+from routes.category_routes import category_bp
+app.register_blueprint(category_bp)
+sys_log.info("[Blueprint] ✅ 分類 CRUD Blueprint 已註冊")
+
 # ==========================================
 # 通知模板管理 Blueprint
 # ==========================================
@@ -1018,51 +1022,6 @@ def system_settings_page():
     """系統設定與匯入頁面"""
     return render_template('system_settings.html', system_version=SYSTEM_VERSION)
 
-@app.route('/api/categories', methods=['POST'])
-def add_category():
-    """API: 新增分類"""
-    name = request.form.get('name')
-    url = request.form.get('url')
-    if not name or not url:
-        return jsonify({"status": "error", "message": "名稱和 URL 皆不可為空"}), 400
-
-    categories = load_categories()
-    new_id = int(time.time() * 1000) # 使用時間戳作為簡易唯一 ID
-    categories.append({'id': new_id, 'name': name, 'url': url})
-    save_categories(categories)
-    
-    return jsonify({"status": "success", "message": "分類新增成功"})
-
-@app.route('/api/categories/<int:category_id>', methods=['PUT'])
-def update_category(category_id):
-    """API: 更新分類"""
-    name = request.form.get('name')
-    url = request.form.get('url')
-    if not name or not url:
-        return jsonify({"status": "error", "message": "名稱和 URL 皆不可為空"}), 400
-
-    categories = load_categories()
-    category_found = False
-    for cat in categories:
-        if cat.get('id') == category_id:
-            cat['name'] = name
-            cat['url'] = url
-            category_found = True
-            break
-    
-    if not category_found:
-        return jsonify({"status": "error", "message": "找不到指定的分類 ID"}), 404
-
-    save_categories(categories)
-    return jsonify({"status": "success", "message": "分類更新成功"})
-
-@app.route('/api/categories/<int:category_id>', methods=['DELETE'])
-def delete_category(category_id):
-    """API: 刪除分類"""
-    categories = [cat for cat in load_categories() if cat.get('id') != category_id]
-    save_categories(categories)
-    return jsonify({"status": "success", "message": "分類刪除成功"})
-
 @app.route('/api/test_url', methods=['POST'])
 def test_url():
     """API: 測試網址是否有效"""

routes/category_routes.py

@@ -0,0 +1,47 @@
+"""分類 CRUD Blueprint。從 app.py 抽離（Phase 3e）。"""
+import time
+
+from flask import Blueprint, jsonify, request
+
+from services.json_storage import load_categories, save_categories
+
+category_bp = Blueprint('category', __name__, url_prefix='/api/categories')
+
+
+@category_bp.route('', methods=['POST'])
+def add_category():
+    name = request.form.get('name')
+    url = request.form.get('url')
+    if not name or not url:
+        return jsonify({"status": "error", "message": "名稱和 URL 皆不可為空"}), 400
+
+    categories = load_categories()
+    new_id = int(time.time() * 1000)
+    categories.append({'id': new_id, 'name': name, 'url': url})
+    save_categories(categories)
+    return jsonify({"status": "success", "message": "分類新增成功"})
+
+
+@category_bp.route('/<int:category_id>', methods=['PUT'])
+def update_category(category_id):
+    name = request.form.get('name')
+    url = request.form.get('url')
+    if not name or not url:
+        return jsonify({"status": "error", "message": "名稱和 URL 皆不可為空"}), 400
+
+    categories = load_categories()
+    for cat in categories:
+        if cat.get('id') == category_id:
+            cat['name'] = name
+            cat['url'] = url
+            save_categories(categories)
+            return jsonify({"status": "success", "message": "分類更新成功"})
+
+    return jsonify({"status": "error", "message": "找不到指定的分類 ID"}), 404
+
+
+@category_bp.route('/<int:category_id>', methods=['DELETE'])
+def delete_category(category_id):
+    categories = [cat for cat in load_categories() if cat.get('id') != category_id]
+    save_categories(categories)
+    return jsonify({"status": "success", "message": "分類刪除成功"})