refactor(channels): make built-in channels self-contained (#4908)

* refactor(channels): own setup and instance contracts

* refactor(channels): isolate management contracts

* refactor(channels): normalize activation contracts

* fix(channels): enforce management contracts

* refactor(channels): finish setup ownership migration

* fix(channels): harden management contracts

* fix(channels): enforce lazy loading and runtime ownership

* fix(feishu): make multi-instance startup idempotent

* fix(webui): render channel setup contracts cleanly

* fix(feishu): stop websocket clients cleanly

* fix(channels): enforce persistence and activation gates

* fix(channels): preserve global feature action scope

* fix(channels): apply defaults for single plugins

* fix(channels): enforce management contract boundaries

* refactor(feishu): remove identity helper indirection

* fix(channels): preserve management setup contracts

* refactor(channels): generalize instance settings UI

* refactor(channels): package channel plugins with web UI metadata

* refactor(channels): make built-ins self-contained packages

* test(channels): colocate tests with channel packages

* fix(dingtalk): use official brand icon

* feat(channels): colocate webui translations

* docs(channels): clarify plugin ownership

* test(exec): remove output wait race

* refactor(channels): unify plugin descriptors

* fix(channels): enforce descriptor-owned contracts

* refactor(channels): finish package-owned plugin setup

* refactor(channels): use repository-owned packages only

* fix(channels): self-describe dependencies and runtime state

* fix(channels): warn about legacy entry points

webui/src/i18n/locales/ko/common.json

@@ -513,13 +513,51 @@
       "needsConfig": "설정 필요",
       "connect": "연결",
       "reconnect": "다시 연결",
-      "feishuQrAlt": "Feishu 연결 QR 코드",
-      "feishuScanTitle": "Feishu로 스캔",
-      "feishuScanDescription": "휴대폰의 Feishu 또는 Lark로 이 코드를 스캔하세요. 승인 후 nanobot이 자동으로 설정을 완료합니다.",
-      "feishuWaiting": "승인을 기다리는 중...",
-      "feishuConnected": "Feishu가 연결되었습니다.",
-      "feishuConnectStopped": "연결이 중지되었습니다.",
-      "feishuConnecting": "연결 중..."
+      "advanced": "고급",
+      "checkAndEnable": "확인 후 활성화",
+      "checkConnection": "연결 확인",
+      "checkedAndEnabled": "확인 후 활성화했습니다.",
+      "checking": "확인 중...",
+      "checkOnly": "확인만",
+      "commandCopied": "명령을 복사했습니다.",
+      "commandCopyFailed": "명령을 복사하지 못했습니다.",
+      "configuredInstances": "인스턴스 {{count}}개 구성됨",
+      "connectPreview": "다음 단계에서 브라우저 내 연결을 진행합니다. 지금은 아래 명령을 실행하세요.",
+      "copyCommand": "명령 복사",
+      "filterAll": "전체",
+      "filterOff": "꺼짐",
+      "filterOn": "켜짐",
+      "helperCopied": "{{name}}을(를) 복사했습니다.",
+      "helperCopyFailed": "{{name}}을(를) 복사하지 못했습니다.",
+      "hideSecret": "비밀 값 숨기기",
+      "instanceConfigured": "구성됨",
+      "instanceNeedsSetup": "설정 필요",
+      "runtimeFailed": "시작 실패",
+      "runtimeStarting": "시작 중",
+      "runtimeStopped": "실행 중 아님",
+      "managedByWebui": "WebUI에서 관리",
+      "officialGuide": "공식 가이드",
+      "optional": "선택 사항",
+      "providerPreset": "제공자",
+      "requiredSetup": "필수 설정",
+      "savedSecret": "저장됨",
+      "savedSecretPlaceholder": "저장된 비밀 값",
+      "savedSettings": "설정을 저장했습니다.",
+      "saveSettings": "설정 저장",
+      "selectChannel": "{{name}} 설정 보기",
+      "setupSteps": "다음 단계",
+      "showSecret": "비밀 값 표시",
+      "toggleChannel": "{{name}} 채널",
+      "toggleInstance": "{{name}} 인스턴스",
+      "tryIt": "사용해 보기",
+      "validationFailed": "활성화하기 전에 필수 설정을 확인하세요.",
+      "validation": {
+        "connected": "연결됨",
+        "configured": "수동 구성됨",
+        "needs_setup": "설정 필요",
+        "invalid": "잘못됨",
+        "unsupported": "수동 설정"
+      }
     },
     "nanobotFeatures": {
       "enabled": "활성화됨",