refactor(p1-01f): JSON 持久化抽到 services/json_storage.py

- load_categories / save_categories / load_scheduler_stats 三個函數搬出
- CATEGORIES_JSON_PATH / SCHEDULER_STATS_PATH 常數同步搬移
- app.py 改 import 維持原呼叫路徑

行數變化: app.py 7,070 → 7,053 (-17)

app.py

@@ -407,29 +407,12 @@ sys_log.info("[Template] ✅ 全域模板變數已注入 (metabase_url, grist_ur
 # ================= 🛠️ V9.72: 分類設定管理核心 =================
 CATEGORIES_JSON_PATH = os.path.join(BASE_DIR, 'data', 'categories.json')
 
-def load_categories():
-    """從 JSON 檔案載入分類列表"""
-    try:
-        with open(CATEGORIES_JSON_PATH, 'r', encoding='utf-8') as f:
-            return json.load(f)
-    except (FileNotFoundError, json.JSONDecodeError):
-        return []
-
-def save_categories(categories):
-    """將分類列表儲存到 JSON 檔案"""
-    with open(CATEGORIES_JSON_PATH, 'w', encoding='utf-8') as f:
-        json.dump(categories, f, ensure_ascii=False, indent=4)
-
-def load_scheduler_stats():
-    """讀取排程統計資料"""
-    stats_path = os.path.join(BASE_DIR, 'data', 'scheduler_stats.json')
-    if os.path.exists(stats_path):
-        try:
-            with open(stats_path, 'r', encoding='utf-8') as f:
-                return json.load(f)
-        except (IOError, json.JSONDecodeError):
-            return {}
-    return {}
+# JSON 持久化：實作搬至 services/json_storage.py
+from services.json_storage import (  # noqa: E402, F401
+    load_categories,
+    save_categories,
+    load_scheduler_stats,
+)
 
 # ================= 🛠️ 數據處理核心 (封裝) =================
 

services/json_storage.py

@@ -0,0 +1,37 @@
+"""JSON 檔案儲存：分類設定、排程統計等小型持久化資料。
+
+從 app.py 抽出。每個函數對應一個 JSON 檔案。
+"""
+import json
+import os
+
+from config import BASE_DIR
+
+CATEGORIES_JSON_PATH = os.path.join(BASE_DIR, 'data', 'categories.json')
+SCHEDULER_STATS_PATH = os.path.join(BASE_DIR, 'data', 'scheduler_stats.json')
+
+
+def load_categories():
+    """從 JSON 檔案載入分類列表（檔案不存在或損毀回傳 []）。"""
+    try:
+        with open(CATEGORIES_JSON_PATH, 'r', encoding='utf-8') as f:
+            return json.load(f)
+    except (FileNotFoundError, json.JSONDecodeError):
+        return []
+
+
+def save_categories(categories):
+    """將分類列表儲存到 JSON 檔案。"""
+    with open(CATEGORIES_JSON_PATH, 'w', encoding='utf-8') as f:
+        json.dump(categories, f, ensure_ascii=False, indent=4)
+
+
+def load_scheduler_stats():
+    """讀取排程統計資料（檔案不存在或損毀回傳 {}）。"""
+    if os.path.exists(SCHEDULER_STATS_PATH):
+        try:
+            with open(SCHEDULER_STATS_PATH, 'r', encoding='utf-8') as f:
+                return json.load(f)
+        except (IOError, json.JSONDecodeError):
+            return {}
+    return {}