feat(lsp): add Vue Language Server support

[amondnet]

Add Vue Language Server support to packages/lsp with Full Hybrid Mode architecture matching the Python reference implementation (ref/serena/src/solidlsp/language_servers/vue_language_server.py).

Architecture

• VueServer - Main Vue language server using @vue/language-server
  • hybridMode: true enabled
  • Handles .vue file operations
• Companion TypeScript Server - typescript-language-server + @vue/typescript-plugin
  • Provides cross-file TypeScript intelligence
  • Vue plugin enables .vue file awareness

Dependencies (npm install to ~/.cache/dora/vue-lsp/)

• @vue/language-server@2.2.0
• @vue/typescript-plugin@2.2.0
• typescript@5.7.2
• typescript-language-server@4.3.3

Tasks

• T001 [P] Add VUE_RUNTIME_DEPS configuration constant
• T002 [P] Add getVueResourcesDir() and getVueExpectedVersion() helpers
• T003 Add setupVueDependencies() function with npm install (depends on T001, T002)
• T004 Add VueServer definition with dual-server spawn (depends on T003)
• T005 [P] Export VueServer from index.ts (depends on T004)
• T006 [P] Add VueServer to LSP_SERVERS array (depends on T004)
• T007 Add unit tests for VueServer (depends on T006)
• T008 [P] Create vue-project test fixture
• T009 Add integration tests for VueServer (depends on T007, T008)

Dependencies & Execution Order

Parallel Group 1 (independent, no dependencies):

• T001: VUE_RUNTIME_DEPS constant
• T002: Helper functions

Sequential:

• T003: setupVueDependencies (needs T001, T002)
• T004: VueServer definition (needs T003)

Parallel Group 2 (depends on T004):

• T005: Export from index.ts
• T006: Add to LSP_SERVERS

Testing:

• T007: Unit tests (needs T006)
• T008: Test fixture (parallel)
• T009: Integration tests (needs T007, T008)

Files to Modify/Create

• packages/lsp/src/server.ts - Add VueServer (~300 lines)
• packages/lsp/src/index.ts - Export VueServer
• packages/lsp/test/unit/server.test.ts - Add VueServer unit tests
• packages/lsp/test/integration/vue.integration.test.ts - Create
• packages/lsp/test/fixtures/vue-project/ - Create test fixture