chore: refactor to monorepo structure for multi-language support

Summary of changes:
- Created 'core/' directory and moved native Node.js implementation (server/exchanges) into it.
- Renamed root package to 'pmxt-core'.
- Set up root 'package.json' with workspaces for 'core' and 'sdks/*'.
- Created 'sdks/typescript' as a placeholder for the future HTTP client.
- Updated root README.md with corrected links and restored ESM compatibility notes.
- Added CONTRIBUTING.md with monorepo structure and development guide.

Author: realfishsam

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 qoery.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.