fix: yaml stdio per-connection, iac catalog path, makefile port

- yaml-language-server: rewrite to stdio per WebSocket (fixes crash loop)
  vscode-jsonrpc v9 createServerSocketTransport is a TCP client, not server
  now spawns yaml-language-server --stdio per connection via asyncio subprocess

- bicep/modules.py: add /iac_source_catalog.json as first path in _IAC_SOURCE_PATHS
  Dockerfile copies to /iac_source_catalog.json but path wasn't listed

- server.py: remove YAML_LSP_PORT daemon (no longer needed with stdio mode)

- Makefile: add -e HTTP_PORT=$(HEALTH_PORT) to all docker run commands
  server defaulted to :8000 but Makefile exposed :2089 with no override

ilsp/bicep_lsp/modules.py

@@ -31,7 +31,8 @@ _CATALOG_PATHS = [
 
 # IAC source catalog — richer param descriptions from Bicep source code
 _IAC_SOURCE_PATHS = [
-    pathlib.Path("/data/iac_source_catalog.json"),          # volume-mount
+    pathlib.Path("/iac_source_catalog.json"),               # baked into Docker image
+    pathlib.Path("/data/iac_source_catalog.json"),          # volume-mount (future)
     pathlib.Path(__file__).parent.parent.parent / "iac_source_catalog.json",  # dev
 ]