v2 platform foundation (docs 01/02/03): Action Runtime + Registry + unified API

- v2 foundation: ActionResult/DevError/ActorContext/ResourceRef/Execution types
- ActionRegistry + ResourceRegistry (namespaced types, FAIL FAST on duplicates)
- ActionRuntime pipeline: validate -> authorize -> middleware -> handler ->
  output validation -> audit -> event -> execution persisted (devos_action_executions)
- Legacy bridge: v1 services registered as devops.*/core.* resources & actions (47 actions, 9 resources)
- Unified Action API: POST /api/v2/actions/:actionId, GET discovery (actions/resources)
- 10 v2 unit tests (registry fail-fast, validation, authz, failure audit, events)

prisma/schema.prisma

@@ -732,3 +732,29 @@ model Certificate {
 
   @@index([workspaceId])
 }
+
+// ============ v2 Action Runtime ============
+
+/// # 数据库表 devos_action_executions：v2 Action 执行记录（docs 03 §31）
+model ActionExecution {
+  id           String   @id
+  actionId     String
+  actorType    String
+  actorId      String?
+  resourceType String?
+  resourceId   String?
+  status       String
+  input        Json?
+  output       Json?
+  error        Json?
+  requestId    String?
+  rootExecutionId String?
+  parentExecutionId String?
+  durationMs   Int?
+  startedAt    DateTime?
+  completedAt  DateTime?
+  createdAt    DateTime @default(now())
+
+  @@index([actionId, createdAt])
+  @@index([status])
+}