feat: complete reorganize-long-files cleanup

- Extract tool instance lifecycle endpoints (start/stop/restart/delete) from
  api/tool/tool_instances.py into new api/tool/tool_lifecycle.py.
- Register tool_lifecycle_router in main.py and api/tool/__init__.py.
- Extract inline WorkspaceDetailPage components into
  components/features/workspace/: detail header, tab bars, file/git/tools/settings
  panels. Slim page from ~446 to ~62 lines.
- Update OpenSpec reorganize-long-files tasks to reflect completed work and
  current source state; mark change completed.
- Regenerate project maps.

Quality gates: python3 -m py_compile (backend clean), npm run typecheck,
npm run lint, npm test -- --run (87 passed), pytest workspace integration
and unit tests (27 passed, 1 skipped).

openspec/changes/reorganize-long-files/.pi-map.index.md

@@ -1,11 +1,11 @@
-# reorganize-long-files (index)
-dir: reorganize-long-files
+# openspec/changes/reorganize-long-files (index)
+dir: openspec/changes/reorganize-long-files
 
 ## role
-Contains planning and specification documents for a structural refactoring initiative to modularize monolithic frontend pages and backend routers into thinner, more maintainable components.
+Tracks a completed structural refactoring initiative to decompose monolithic frontend pages and backend routers into smaller, focused components and services.
 ## parent
-index: ./.pi-map.index.md
-map: ./.pi-map.md
+index: openspec/changes/.pi-map.index.md
+map: openspec/changes/.pi-map.md
 ## children
 -
 ## files
@@ -14,8 +14,8 @@ map: ./.pi-map.md
 - spec.md
 - tasks.md
 ## links
-index: reorganize-long-files/.pi-map.index.md
-map: reorganize-long-files/.pi-map.md
+index: openspec/changes/reorganize-long-files/.pi-map.index.md
+map: openspec/changes/reorganize-long-files/.pi-map.md
 ## workflows
 -
 ## dirty