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

backend/adapters/arma3/config_generator.py

@@ -382,6 +382,37 @@ class Arma3ConfigGenerator:
             args.extend(mod_args)
         return args
 
+    def get_ui_schema(self) -> dict:
+        return {
+            "server": {
+                "hostname":          {"widget": "text",     "label": "Server Hostname"},
+                "max_players":       {"widget": "number",   "label": "Max Players", "min": 1, "max": 1000},
+                "password":          {"widget": "password", "label": "Player Password"},
+                "password_admin":    {"widget": "password", "label": "Admin Password"},
+                "motd_lines":        {"widget": "textarea", "label": "Message of the Day (one line per row)"},
+                "forced_difficulty": {"widget": "select",   "label": "Difficulty Preset",
+                                      "options": ["Recruit", "Regular", "Veteran", "Custom"]},
+                "battleye":          {"widget": "toggle",   "label": "BattleEye Anti-Cheat"},
+                "disable_von":       {"widget": "toggle",   "label": "Disable Voice over Net (VoN)"},
+                "verify_signatures": {"widget": "number",   "label": "Verify Signatures (0=off, 1=on, 2=strict)",
+                                      "min": 0, "max": 2},
+                "persistent":        {"widget": "toggle",   "label": "Persistent (keep running when empty)"},
+                "admin_uids":        {"widget": "tag-list", "label": "Admin Steam UIDs",
+                                      "placeholder": "76561198000000000"},
+            },
+            "basic": {
+                "max_custom_file_size": {"widget": "number", "label": "Max Custom File Size (bytes)"},
+            },
+            "launch": {
+                "extra_params": {"widget": "tag-list", "label": "Additional Startup Parameters",
+                                 "placeholder": "-limitFPS=100"},
+            },
+            "rcon": {
+                "rcon_password": {"widget": "password", "label": "RCon Password"},
+                "max_ping":      {"widget": "number",   "label": "RCon Port"},
+            },
+        }
+
     def preview_config(
         self,
         server_id: int,

backend/core/servers/router.py

@@ -134,6 +134,15 @@ def get_config(
     return _ok(ServerService(db).get_config(server_id))
 
 
+@router.get("/{server_id}/config/schema")
+def get_config_schema(
+    server_id: int,
+    db: Annotated[Connection, Depends(get_db)] = None,
+    _user: Annotated[dict, Depends(get_current_user)] = None,
+):
+    return _ok(ServerService(db).get_config_schema(server_id))
+
+
 @router.get("/{server_id}/config/preview")
 def get_config_preview(
     server_id: int,

backend/core/servers/service.py

@@ -396,6 +396,14 @@ class ServerService:
                     data[field] = "***"
         return sections
 
+    def get_config_schema(self, server_id: int) -> dict:
+        server = self.get_server(server_id)
+        adapter = GameAdapterRegistry.get(server["game_type"])
+        config_gen = adapter.get_config_generator()
+        if hasattr(config_gen, "get_ui_schema"):
+            return config_gen.get_ui_schema()
+        return {}
+
     def get_config_section(self, server_id: int, section: str) -> dict:
         server = self.get_server(server_id)
         adapter = GameAdapterRegistry.get(server["game_type"])