feat(rpc): add the caller-side example and close remaining coverage gaps

Adds examples/auth-showcase/app/services/greeter-client.ts so the showcase
demonstrates both halves - the review noted the example was callee-only, so a
developer had no working reference for making a call.

Raises integration coverage to the planned 3 tests and adds the missing
rpc-endpoint cases. Also wires the prod build path for services.

304 tests pass across rpc/router/dev-server/cli; typecheck, lint, format and
check:public-api all clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/dev-server/src/prod.ts

@@ -73,6 +73,8 @@ export interface ProdManifest {
   components: { name: string; mod: RouteModule }[];
   /** Named page layouts (from app/layouts/*.wrn). */
   layouts: { name: string; mod: RouteModule }[];
+  /** RPC service implementations (from app/services/*.ts). */
+  services?: { name: string; mod: RouteModule }[];
 }
 
 export interface ProductionPluginAsset {
@@ -277,6 +279,8 @@ function buildProdRouter(manifest: ProdManifest): {
   for (const c of manifest.components) modules.set(c.name, c.mod);
   // Layouts share the module map under a `layout:` prefix (no name collisions).
   for (const l of manifest.layouts) modules.set(`layout:${l.name}`, l.mod);
+  for (const service of manifest.services ?? [])
+    modules.set(`service:${service.name}`, service.mod);
 
   const router: Router = {
     pages,
@@ -288,7 +292,10 @@ function buildProdRouter(manifest: ProdManifest): {
     stores: [],
     schemas: [], // descriptors are pre-baked into schemasJs; not needed at runtime
     authz: [], // authz declarations are not needed at runtime in production
-    services: [], // RPC service modules are not yet emitted in production manifests
+    services: (manifest.services ?? []).map((service) => ({
+      name: service.name,
+      file: `service:${service.name}`,
+    })),
     matchPage: optimizedMatcher(pages),
     matchApi: optimizedMatcher(api),
     matchRealtime: optimizedMatcher(realtime),