feat(remote-speakers): enhance remote speaker management and API integration

- Added support for remote speaker configuration in the README and documentation.
- Implemented a new endpoint for retrieving the bundle signing public key.
- Updated the `evobgp-agent` to include a `serve` command for Panel→Node sync API.
- Enhanced CI workflow to validate remote speaker compose files.
- Introduced new fields in the API and UI for managing speaker metadata, including dispatch status and sync status.
- Improved error handling and response formatting in speaker-related API endpoints.
- Updated documentation to reflect changes in remote speaker functionality and usage guidelines.

.gitea/workflows/ci.yaml

@@ -198,6 +198,8 @@ jobs:
         run: sh scripts/lint-httpapi.sh
       - name: Check migration pairs (DEP-03)
         run: sh scripts/check-migrations-pair.sh
+      - name: Validate remote speaker compose
+        run: sh scripts/validate-remote-speaker-compose.sh
       # go.mod: go 1.24 — бинарник golangci-lint < v1.64.2 (сборка на Go 1.23) не запускается.
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6