feat: AI 工具架构重构与微信增强 (0.2.17 → 0.2.22)

0.2.17 收束模型初始工具列表：
- 仅暴露 query_capabilities/query_capability_detail/call_capability 三个入口
- API 能力统一通过 iAs HTTP API 封装，删除重复 YAML 工具

0.2.18 系统提示词拆分：
- 固定系统提示词硬编码，动态附加部分 AI 可维护
- 新增 update_additional_system_prompt 能力和持久化

0.2.19 上下文增强与打断语义：
- /new 拥有最高打断语义，取消运行中任务并清除当前 turn
- raw_message JSONB 原文入库，群聊按 group_id 隔离作用域
- 工具调用说明替代动态附加系统提示词

0.2.20 微信输入中状态：
- 改用官方 getconfig + sendtyping 流程，显式管理 typing 状态

0.2.21 API 文档功能分组：
- /v1/api-docs 返回 groups，帮助 AI 按功能面发现接口

0.2.22 AI API 能力去重：
- 移除与 HTTP endpoint 重复的专用能力，统一用 query_api_docs + call_http_api
- 删除不再编译的 web/memory 工具文件

ias-service/migrations/20260708004000_context_raw_and_tool_instructions.sql

@@ -0,0 +1,76 @@
+ALTER TABLE ias_context_messages
+    ADD COLUMN IF NOT EXISTS raw_message JSONB;
+
+ALTER TABLE ias_context_messages
+    ADD COLUMN IF NOT EXISTS external_message_id VARCHAR(255);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_ias_context_messages_external_unique
+    ON ias_context_messages(session_id, role, external_message_id)
+    WHERE external_message_id IS NOT NULL;
+
+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 = 'active_session_deduplicated',
+    summary = COALESCE(summary, '创建活跃会话唯一约束时自动结束的重复活跃上下文。')
+FROM ranked
+WHERE session.id = ranked.id
+    AND ranked.rank > 1;
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_ias_context_sessions_one_active
+    ON ias_context_sessions(scope_key)
+    WHERE ended_at IS NULL;
+
+CREATE TABLE IF NOT EXISTS ias_tool_call_instructions (
+    id BIGSERIAL PRIMARY KEY,
+    scope_key VARCHAR(768) NOT NULL UNIQUE,
+    channel VARCHAR(64) NOT NULL,
+    account_id VARCHAR(255) NOT NULL,
+    from_user_id VARCHAR(255) NOT NULL,
+    context_label TEXT,
+    content TEXT NOT NULL DEFAULT '',
+    last_reason TEXT,
+    updated_by VARCHAR(64) NOT NULL DEFAULT 'ai',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_ias_tool_call_instructions_scope_updated
+    ON ias_tool_call_instructions(scope_key, updated_at DESC);
+
+INSERT INTO ias_tool_call_instructions (
+    scope_key,
+    channel,
+    account_id,
+    from_user_id,
+    context_label,
+    content,
+    last_reason,
+    updated_by,
+    created_at,
+    updated_at
+)
+SELECT
+    scope_key,
+    channel,
+    account_id,
+    from_user_id,
+    context_label,
+    content,
+    last_reason,
+    updated_by,
+    created_at,
+    updated_at
+FROM ias_additional_system_prompts
+WHERE content <> ''
+ON CONFLICT (scope_key) DO NOTHING;