fix(config): load lsp config from jsonc configuration files

[COLDTURNIP]

Summary

The LSP server config loader currently hardcodes .json filenames, so JSONC-only configs (e.g. opencode.jsonc, oh-my-opencode.jsonc) are not discovered. Reuses the existing detectConfigFile() helper (already used by the main plugin config loader) inside src/tools/lsp/server-config-loader.ts:getConfigPaths() so LSP config discovery prefers .jsonc and falls back to .json.

Changes

• Code: LSP config path discovery uses detectConfigFile() for project/user/opencode config files

• Tests: regression coverage for JSONC-only filename lookup and .jsonc precedence

• Docs: clarify that .jsonc priority applies to LSP tool config discovery too

Testing

• Regression tests in src/tools/lsp/server-config-loader.test.ts

Related Issues

#1763

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Summary by cubic

Fixes LSP server config discovery to load .jsonc files and prefer them over .json. Prevents missing configs when projects use JSONC-only files and keeps LSP discovery consistent with the main config loader.

• Bug Fixes
  • getConfigPaths() now uses detectConfigFile() for project, user, and opencode configs, with .jsonc precedence.
  • Expanded tests to cover JSONC-only discovery and .jsonc-over-.json precedence across user/project/opencode, including getMergedServers.
  • Updated README and configuration docs to list .jsonc paths, platform-specific precedence, and removal steps.

^{Written for commit f80b72c. Summary will update on new commits.}

[github-actions]

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[cubic-dev-ai]

No issues found across 4 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: Documentation-only changes adding .jsonc support with comprehensive tests. All changes are additive (backward compatible), tests verify new functionality works correctly. No logic regressions possible}

[COLDTURNIP]

I have read the CLA Document and I hereby sign the CLA