feat(mcp-phase3): ArgoCD MCP + Sentry MCP + 完整 Provider 註冊

ArgoCDProvider (3 工具):
  - argocd_list_apps: 列出所有 App + sync/health 狀態
  - argocd_get_app_status: 詳細狀態 + 問題資源清單
  - argocd_get_sync_history: 最近 N 筆部署記錄
  - 輸入驗證: app_name 白名單 regex
  - 需 ARGOCD_API_TOKEN + ARGOCD_MCP_ENABLED=true

SentryProvider (3 工具):
  - sentry_list_issues: 列出最近 Issues（狀態過濾）
  - sentry_get_issue: 詳情 + stacktrace 最後 5 frames
  - sentry_search_issues: PromQL 風格搜尋
  - issue_id 白名單驗證（只允許純數字）
  - 需 SENTRY_AUTH_TOKEN + SENTRY_MCP_ENABLED=true

providers/__init__.py: 補上 Prometheus + SSH + ArgoCD + Sentry 全部 10 個 providers
config.py: 新增 ARGOCD_URL / ARGOCD_API_TOKEN / ARGOCD_MCP_ENABLED / SENTRY_MCP_ENABLED

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/plugins/mcp/providers/__init__.py

@@ -9,21 +9,31 @@ MCP Tool Providers - ADR-015 模組化架構
 - FilesystemProvider: 安全受限的文件讀取 (#82)
 - GrafanaProvider: Grafana Dashboard 查詢 (#83)
 - RAGProvider: 維運手冊語義搜尋 (#84)
+- PrometheusProvider: Prometheus 即時查詢 (MCP Phase 2b)
+- SSHProvider: 主機層 SSH 診斷/操作 (MCP Phase 2a)
+- ArgoCDProvider: ArgoCD GitOps 狀態查詢 (MCP Phase 3)
+- SentryProvider: Sentry 錯誤追蹤查詢 (MCP Phase 3)
 
 @see docs/adr/ADR-015-mcp-modular-architecture.md
 
 變更紀錄:
+- 2026-04-11 v1.6: 新增 ArgoCDProvider + SentryProvider (MCP Phase 3) - Claude Sonnet 4.6
+- 2026-04-11 v1.5: 新增 PrometheusProvider + SSHProvider (MCP Phase 2) - Claude Sonnet 4.6
 - 2026-03-27 v1.3: 新增 RAGProvider (#84) - Claude Code (台北時區)
 - 2026-03-26 v1.2: 新增 GrafanaProvider (#83) - Claude Code
 - 2026-03-26 v1.1: 新增 FilesystemProvider (#82) - Claude Code
 """
 
+from src.plugins.mcp.providers.argocd_provider import ArgoCDProvider
 from src.plugins.mcp.providers.database_provider import DatabaseProvider
 from src.plugins.mcp.providers.filesystem_provider import FilesystemProvider
 from src.plugins.mcp.providers.grafana_provider import GrafanaProvider
 from src.plugins.mcp.providers.k8s_provider import K8sProvider
+from src.plugins.mcp.providers.prometheus_provider import PrometheusProvider
 from src.plugins.mcp.providers.rag_provider import RAGProvider
+from src.plugins.mcp.providers.sentry_provider import SentryProvider
 from src.plugins.mcp.providers.signoz_provider import SignOzProvider
+from src.plugins.mcp.providers.ssh_provider import SSHProvider
 
 __all__ = [
     "K8sProvider",
@@ -32,6 +42,10 @@ __all__ = [
     "FilesystemProvider",
     "GrafanaProvider",
     "RAGProvider",
+    "PrometheusProvider",
+    "SSHProvider",
+    "ArgoCDProvider",
+    "SentryProvider",
 ]
 
 
@@ -49,3 +63,7 @@ def register_all_providers() -> None:
     register_provider(FilesystemProvider())
     register_provider(GrafanaProvider())
     register_provider(RAGProvider())
+    register_provider(PrometheusProvider())
+    register_provider(SSHProvider())
+    register_provider(ArgoCDProvider())
+    register_provider(SentryProvider())