refactor(core): restructure conversation, channel and message domains

- Rename chat module to conversation with flow-based architecture
- Move channelidentities into channel/identities subpackage
- Add channel/route for routing logic
- Add message service with event hub
- Add MCP providers: container, directory, schedule
- Refactor Feishu/Telegram adapters with directory and stream support
- Add platform management page and channel badges in web UI
- Update database schema for conversations, messages and channel routes
- Add @memoh/shared package for cross-package type definitions

internal/handlers/settings.go

@@ -44,7 +44,6 @@ func (h *SettingsHandler) Register(e *echo.Echo) {
 // @Summary Get user settings
 // @Description Get agent settings for current user
 // @Tags settings
-// @Param bot_id path string true "Bot ID"
 // @Success 200 {object} settings.Settings
 // @Failure 400 {object} ErrorResponse
 // @Failure 500 {object} ErrorResponse
@@ -72,7 +71,6 @@ func (h *SettingsHandler) Get(c echo.Context) error {
 // @Summary Update user settings
 // @Description Update or create agent settings for current user
 // @Tags settings
-// @Param bot_id path string true "Bot ID"
 // @Param payload body settings.UpsertRequest true "Settings payload"
 // @Success 200 {object} settings.Settings
 // @Failure 400 {object} ErrorResponse
@@ -109,7 +107,6 @@ func (h *SettingsHandler) Upsert(c echo.Context) error {
 // @Summary Delete user settings
 // @Description Remove agent settings for current user
 // @Tags settings
-// @Param bot_id path string true "Bot ID"
 // @Success 204 "No Content"
 // @Failure 400 {object} ErrorResponse
 // @Failure 500 {object} ErrorResponse