feat: channel gateway implementation and multi-bot refactor

- Refactor channel manager with support for Sender/Receiver interfaces and hot-swappable adapters.
- Implement identity routing and pre-authentication logic for inbound messages.
- Update database schema to support bot pre-auth keys and extended channel session metadata.
- Add Telegram and Feishu channel configuration and adapter enhancements.
- Update Swagger documentation and internal handlers for channel management.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/db/sqlc/preauth.sql.go

@@ -0,0 +1,89 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+// source: preauth.sql
+
+package sqlc
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+const createBotPreauthKey = `-- name: CreateBotPreauthKey :one
+INSERT INTO bot_preauth_keys (bot_id, token, issued_by_user_id, expires_at)
+VALUES ($1, $2, $3, $4)
+RETURNING id, bot_id, token, issued_by_user_id, expires_at, used_at, created_at
+`
+
+type CreateBotPreauthKeyParams struct {
+	BotID          pgtype.UUID        `json:"bot_id"`
+	Token          string             `json:"token"`
+	IssuedByUserID pgtype.UUID        `json:"issued_by_user_id"`
+	ExpiresAt      pgtype.Timestamptz `json:"expires_at"`
+}
+
+func (q *Queries) CreateBotPreauthKey(ctx context.Context, arg CreateBotPreauthKeyParams) (BotPreauthKey, error) {
+	row := q.db.QueryRow(ctx, createBotPreauthKey,
+		arg.BotID,
+		arg.Token,
+		arg.IssuedByUserID,
+		arg.ExpiresAt,
+	)
+	var i BotPreauthKey
+	err := row.Scan(
+		&i.ID,
+		&i.BotID,
+		&i.Token,
+		&i.IssuedByUserID,
+		&i.ExpiresAt,
+		&i.UsedAt,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const getBotPreauthKey = `-- name: GetBotPreauthKey :one
+SELECT id, bot_id, token, issued_by_user_id, expires_at, used_at, created_at
+FROM bot_preauth_keys
+WHERE token = $1
+LIMIT 1
+`
+
+func (q *Queries) GetBotPreauthKey(ctx context.Context, token string) (BotPreauthKey, error) {
+	row := q.db.QueryRow(ctx, getBotPreauthKey, token)
+	var i BotPreauthKey
+	err := row.Scan(
+		&i.ID,
+		&i.BotID,
+		&i.Token,
+		&i.IssuedByUserID,
+		&i.ExpiresAt,
+		&i.UsedAt,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const markBotPreauthKeyUsed = `-- name: MarkBotPreauthKeyUsed :one
+UPDATE bot_preauth_keys
+SET used_at = now()
+WHERE id = $1
+RETURNING id, bot_id, token, issued_by_user_id, expires_at, used_at, created_at
+`
+
+func (q *Queries) MarkBotPreauthKeyUsed(ctx context.Context, id pgtype.UUID) (BotPreauthKey, error) {
+	row := q.db.QueryRow(ctx, markBotPreauthKeyUsed, id)
+	var i BotPreauthKey
+	err := row.Scan(
+		&i.ID,
+		&i.BotID,
+		&i.Token,
+		&i.IssuedByUserID,
+		&i.ExpiresAt,
+		&i.UsedAt,
+		&i.CreatedAt,
+	)
+	return i, err
+}