feat: 模块统一 ias- 前缀、独立版本与内网地址支持 (0.1.7)

- 所有 Rust crate 统一加 ias- 前缀：ai → ias-ai、common → ias-common、context → ias-context、mail → ias-mail、service → ias-service、wechat → ias-wechat
- 新增 ias-main 模块承载 CLI 入口和二进制打包
- 各模块开始独立维护版本号，ias-main 0.1.7 代表整体版本
- 新增 IA_WEB_INTERNAL_URL 环境变量，版本通知同时发送公网和内网链接
- 将已有升级日志翻译为中文
- ias_upgrade_logs 新增 modules JSONB 字段
- 新增 VERSION 文件和 CHANGELOG.md
- 新增 AGENTS.md 项目规则文件

ias-service/migrations/20260706012000_normalize_context_scope.sql

@@ -0,0 +1,29 @@
+UPDATE ias_long_term_memories
+SET scope_key = channel || ':' || account_id || ':' || from_user_id;
+
+UPDATE ias_context_sessions
+SET scope_key = channel || ':' || account_id || ':' || from_user_id;
+
+UPDATE ias_context_summaries AS summary
+SET scope_key = session.scope_key
+FROM ias_context_sessions AS session
+WHERE summary.source_session_id = session.id;
+
+WITH ranked AS (
+    SELECT
+        id,
+        ROW_NUMBER() OVER (
+            PARTITION BY scope_key
+            ORDER BY started_at DESC, id DESC
+        ) AS rank
+    FROM ias_context_sessions
+    WHERE ended_at IS NULL
+)
+UPDATE ias_context_sessions AS session
+SET
+    ended_at = last_message_at,
+    end_reason = 'scope_normalized',
+    summary = COALESCE(summary, '旧上下文 scope 合并时自动结束。')
+FROM ranked
+WHERE session.id = ranked.id
+    AND ranked.rank > 1;