feat(v1.1.3-modules): shared types, migrations, engine + resolver scaffold

Lays down the v1.1.3 plumbing:

- `ScriptKind` enum in `picloud-shared` ('endpoint' | 'module').
- `ModuleSource` trait + `ModuleScript` DTO + `NoopModuleSource` in
  `picloud-shared`. Resolver lives in `executor-core`; Postgres impl
  in `manager-core` (`PostgresModuleSource`).
- `Services::new` grows a fifth `modules: Arc<dyn ModuleSource>` arg.
- `ScriptValidator` returns `ValidatedScript { imports }` so the
  manager can populate the dep-graph table on save. New
  `validate_module` method on the trait gates module-shape rules.
- `Engine::execute_ast(&Arc<rhai::AST>, req)` lets the orchestrator's
  script cache reuse compiled ASTs. `Engine::execute(&str, req)` is
  preserved as a convenience that compiles inline. `Engine::compile`
  exposes the AST for callers that want to cache.
- `PicloudModuleResolver` replaces `DummyModuleResolver` per-call.
  Bridges Rhai's sync `ModuleResolver::resolve` to async
  `ModuleSource::lookup` via `Handle::block_on`. Enforces:
  - cross-app isolation (resolver captures `Arc<SdkCallCx>`),
  - circular import detection (in-progress stack on the resolver),
  - import depth limit (default 8 via
    `Limits::module_import_depth_max`).
- Module-shape validation walks `ast.statements()` via `rhai/internals`
  and accepts only `Var { CONSTANT }`, `Import`, and `Noop`. The
  manager admin endpoint runs `validate_module` at save (primary
  gate); resolver re-runs it at load (defense in depth).
- LRU cache `(AppId, name) -> (updated_at, Arc<Module>)` owned by
  `Engine`. Size from `PICLOUD_MODULE_CACHE_SIZE` (default 512).
- Migration `0015_scripts_kind.sql` adds `scripts.kind` + composite
  index + module-name shape CHECK.
- Migration `0016_script_imports.sql` adds the dep-graph table with
  FK CASCADE on both columns.
- Repo: `kind` threaded through SELECT/INSERT/UPDATE. New
  `count_routes_for_script` / `count_triggers_for_script` /
  `list_imports` methods. `create`/`update` open a transaction and
  call `replace_imports_tx` to populate the dep-graph.
- Admin endpoint: accepts `kind`; rejects reserved module names;
  rejects `endpoint → module` transitions when routes / triggers
  exist.
- SDK_VERSION 1.3 → 1.4.

Workspace builds; full test suite (~440 tests) green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/picloud/src/lib.rs

@@ -120,12 +120,13 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
     let abandoned_repo: Arc<dyn AbandonedRepo> = Arc::new(PostgresAbandonedRepo::new(pool.clone()));
     let trigger_config = TriggerConfig::from_env();
 
-    // SDK services bundle. v1.1.1 added KV + dead-letter; v1.1.2 adds
-    // the docs store. All four bound services share the
-    // outbox-backed event emitter so KV and docs mutations both fan
-    // out through the same dispatcher.
+    // SDK services bundle. v1.1.1 added KV + dead-letter; v1.1.2 added
+    // the docs store; v1.1.3 adds the module source backing the Rhai
+    // resolver. All bound services share the outbox-backed event
+    // emitter so KV and docs mutations both fan out through the same
+    // dispatcher.
     let kv_repo = Arc::new(PostgresKvRepo::new(pool.clone()));
-    let docs_repo = Arc::new(PostgresDocsRepo::new(pool));
+    let docs_repo = Arc::new(PostgresDocsRepo::new(pool.clone()));
     let events: Arc<dyn ServiceEventEmitter> = Arc::new(OutboxEventEmitter::new(
         trigger_repo.clone(),
         outbox_repo.clone(),
@@ -142,7 +143,9 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
         outbox_repo.clone(),
         authz.clone(),
     ));
-    let services = Services::new(kv, docs, dl_service.clone(), events);
+    let modules: Arc<dyn picloud_shared::ModuleSource> =
+        Arc::new(picloud_manager_core::PostgresModuleSource::new(pool));
+    let services = Services::new(kv, docs, dl_service.clone(), events, modules);
     let engine = Arc::new(Engine::new(Limits::default(), services));
 
     // Compile the routes table once at startup; admin writes refresh it.
@@ -418,4 +421,22 @@ impl picloud_manager_core::ScriptRepository for PostgresScriptRepoHandle {
     ) -> Result<(), picloud_manager_core::ScriptRepositoryError> {
         self.0.delete(id).await
     }
+    async fn count_routes_for_script(
+        &self,
+        script_id: picloud_shared::ScriptId,
+    ) -> Result<i64, picloud_manager_core::ScriptRepositoryError> {
+        self.0.count_routes_for_script(script_id).await
+    }
+    async fn count_triggers_for_script(
+        &self,
+        script_id: picloud_shared::ScriptId,
+    ) -> Result<i64, picloud_manager_core::ScriptRepositoryError> {
+        self.0.count_triggers_for_script(script_id).await
+    }
+    async fn list_imports(
+        &self,
+        script_id: picloud_shared::ScriptId,
+    ) -> Result<Vec<picloud_shared::Script>, picloud_manager_core::ScriptRepositoryError> {
+        self.0.list_imports(script_id).await
+    }
 }