feat: refactor User/Bot architecture and implement multi-channel gateway

Major changes:
1. Core Architecture: Decoupled Bots from Users. Bots now have independent lifecycles, member management (bot_members), and dedicated configurations.
2. Channel Gateway:
   - Implemented a unified Channel Manager supporting Feishu, Telegram, and Local (Web/CLI) adapters.
   - Added message processing pipeline to normalize interactions across different platforms.
   - Introduced a Contact system for identity binding and guest access policies.
3. Database & Tooling:
   - Consolidated all migrations into 0001_init with updated schema for bots, channels, and contacts.
   - Optimized sqlc.yaml to automatically track the migrations directory.
4. Agent Enhancements:
   - Introduced ToolContext to provide Agents with platform-aware execution capabilities (e.g., messaging, contact lookups).
   - Added tool logging and fallback mechanisms for toolChoice execution.
5. UI & Docs: Updated frontend stores, UI components, and Swagger documentation to align with the new Bot-centric model.

db/queries/schedule.sql

@@ -1,21 +1,21 @@
 -- name: CreateSchedule :one
-INSERT INTO schedule (name, description, pattern, max_calls, enabled, command, user_id)
+INSERT INTO schedule (name, description, pattern, max_calls, enabled, command, bot_id)
 VALUES ($1, $2, $3, $4, $5, $6, $7)
-RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id;
+RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id;
 
 -- name: GetScheduleByID :one
-SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id
+SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id
 FROM schedule
 WHERE id = $1;
 
--- name: ListSchedulesByUser :many
-SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id
+-- name: ListSchedulesByBot :many
+SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id
 FROM schedule
-WHERE user_id = $1
+WHERE bot_id = $1
 ORDER BY created_at DESC;
 
 -- name: ListEnabledSchedules :many
-SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id
+SELECT id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id
 FROM schedule
 WHERE enabled = true
 ORDER BY created_at DESC;
@@ -30,7 +30,7 @@ SET name = $2,
     command = $7,
     updated_at = now()
 WHERE id = $1
-RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id;
+RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id;
 
 -- name: DeleteSchedule :exec
 DELETE FROM schedule
@@ -45,5 +45,5 @@ SET current_calls = current_calls + 1,
     END,
     updated_at = now()
 WHERE id = $1
-RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, user_id;
+RETURNING id, name, description, pattern, max_calls, current_calls, created_at, updated_at, enabled, command, bot_id;