feat: Phase 1 — Config UI Schema system with per-field widget routing

- Backend: add Arma3ConfigGenerator.get_ui_schema() with widget hints per field
- Backend: add ServerService.get_config_schema() and GET /config/schema endpoint
- Frontend: add FieldSchema/ConfigSchema types + useServerConfigSchema hook
- Frontend: new TagListEditor component for dynamic string-list editing
- Frontend: ConfigEditor now routes each field to correct widget (text/number/password/textarea/select/toggle/tag-list)
- Frontend: password fields have show/hide toggle; toggles render as checkbox; tag-list uses TagListEditor
- Tests: 8 new tests covering hook and TagListEditor; all 136 tests green

.claude/plan/arma3-ux-enhancement.md

@@ -12,7 +12,7 @@
 
 | Phase | Status | Last session note |
 |-------|--------|------------------|
-| 1 — Config UI Schema | `[ ] not started` | |
+| 1 — Config UI Schema | `[x] done` | TagListEditor, useServerConfigSchema, ConfigEditor widget routing, backend get_ui_schema + endpoint |
 | 2 — Mission Rotation | `[ ] not started` | |
 | 3 — Mod Display Names + Split Pane | `[ ] not started` | |
 | 4 — Player Kick/Ban | `[ ] not started` | |