Enhance smoking tracking API and documentation

- Updated the main.go file to set the local time zone to Asia/Shanghai.
- Changed API endpoints from `PUT` to `POST` for user profile and logs management in multiple documentation files to reflect the correct usage.
- Added new fields in the API response for home summary, including `last_smoke_at`, `today_count`, `resisted_count`, and `reduced_from_yesterday`.
- Enhanced documentation across various files to accurately describe the updated API endpoints and their expected behaviors.

docs/smoke/API.md

@@ -155,7 +155,7 @@ curl -X GET 'http://127.0.0.1:8080/api/v1/smoke/logs/5202' \
 
 ## 6) 更新记录
 
-`PUT /api/v1/smoke/logs/:id`
+`POST /api/v1/smoke/logs/:id`
 
 请求体（字段可选，按需传）：
 
@@ -302,7 +302,7 @@ curl -X GET 'http://127.0.0.1:8080/api/v1/smoke/logs/5202' \
 
 ## 11) 补全/更新用户基础信息（Upsert）
 
-`PUT /api/v1/smoke/profile`
+`POST /api/v1/smoke/profile`
 
 说明：
 - 字段按需传；首次进入建议一次性补全。
@@ -348,6 +348,7 @@ curl -X GET 'http://127.0.0.1:8080/api/v1/smoke/logs/5202' \
 
 说明：
 - 用于首页展示“建议的下次记录时间”。
+- 已整合首页所需汇总字段（上次抽烟时间/今日抽烟支数/今日克制次数/较昨日减少支数）。
 - 如果指定日期存在 AI 给出的时间节点（`time_nodes` 不为空），则优先使用 AI 的建议；否则使用默认策略。
 - 可选参数：
   - `date`：计划日期（默认今天），支持 `YYYY-MM-DD` 或 `today/tomorrow`。
@@ -372,18 +373,22 @@ AI 生成说明：
   "message": "success",
   "data": {
     "source": "default",
-    "not_before_at": "2026-01-05T10:18:00+08:00",
-    "suggested_at": "2026-01-05T10:18:00+08:00",
+    "not_before_at": "2026-01-05 10:18:00",
+    "suggested_at": "2026-01-05 10:18:00",
+    "last_smoke_at": "2026-01-05 09:30:00",
+    "today_count": 3,
+    "resisted_count": 1,
+    "reduced_from_yesterday": 2,
     "default": {
-      "last_smoke_at": "2026-01-05T09:30:00+08:00",
-      "next_smoke_at": "2026-01-05T10:18:00+08:00",
+      "last_smoke_at": "2026-01-05 09:30:00",
+      "next_smoke_at": "2026-01-05 10:18:00",
       "base_interval_minutes": 48,
       "interval_minutes": 48,
       "stage": 0,
       "resisted_7d": 3,
       "sleep_adjusted": false,
       "algorithm": "staircase_delay_v1",
-      "as_of": "2026-01-05T10:00:00+08:00"
+      "as_of": "2026-01-05 10:00:00"
     }
   }
 }
@@ -396,15 +401,19 @@ AI 生成说明：
   "message": "success",
   "data": {
     "source": "ai",
-    "not_before_at": "2026-01-05T10:18:00+08:00",
-    "suggested_at": "2026-01-05T10:28:00+08:00",
+    "not_before_at": "2026-01-05 10:18:00",
+    "suggested_at": "2026-01-05 10:28:00",
+    "last_smoke_at": "2026-01-05 09:30:00",
+    "today_count": 3,
+    "resisted_count": 1,
+    "reduced_from_yesterday": 2,
     "time_nodes": ["10:30", "11:10", "14:00", "16:30"],
     "advice": "先把这次冲动延后到10:28，期间做一次5分钟快走+喝水，压力场景用深呼吸替代。",
     "default": { "algorithm": "staircase_delay_v1" },
     "ai": {
       "plan_date": "2026-01-05",
-      "not_before_at": "2026-01-05T10:18:00+08:00",
-      "suggested_at": "2026-01-05T10:28:00+08:00",
+      "not_before_at": "2026-01-05 10:18:00",
+      "suggested_at": "2026-01-05 10:28:00",
       "time_nodes": ["10:30", "11:10", "14:00", "16:30"],
       "advice": "先把这次冲动延后到10:28，期间做一次5分钟快走+喝水，压力场景用深呼吸替代。",
       "prompt_version": "v1",
@@ -414,3 +423,9 @@ AI 生成说明：
   }
 }
 ```
+
+字段说明（新增首页字段）：
+- `last_smoke_at`：上次“实际抽烟”时间（忽略忍住记录），格式 `YYYY-MM-DD HH:MM:SS`。
+- `today_count`：今日抽烟支数（累加 `num`）。
+- `resisted_count`：今日克制次数（`level=0 && num=0`）。
+- `reduced_from_yesterday`：较昨日减少的支数（`max(昨日支数 - 今日支数, 0)`）。