fix: swagger apis path to src/ + update stale signup/verify test refs

- swagger.ts: changed apis glob from dist/routes/*.js to src/routes/*.ts
  so OpenAPI spec includes demo endpoints during tests (fixes 6 test failures)
- Dockerfile: copy src/ to final stage for runtime swagger-jsdoc
- Updated stale /v1/signup/verify test refs to /v1/signup/free (endpoint
  was removed when free tier was discontinued)

Dockerfile

@@ -53,6 +53,7 @@ RUN npm install --omit=dev
 # Copy compiled artifacts from builder stage
 COPY --from=builder /app/dist ./dist
 COPY --from=builder /app/public ./public
+COPY --from=builder /app/src ./src
 
 # Recreate swagger-ui symlink in production stage
 RUN rm -f public/swagger-ui && ln -s /app/node_modules/swagger-ui-dist public/swagger-ui

src/__tests__/app-routes.test.ts

@@ -101,9 +101,10 @@ describe("App-level routes", () => {
       spec = res.body;
     });
 
-    it("includes POST /v1/signup/verify", () => {
-      expect(spec.paths["/v1/signup/verify"]).toBeDefined();
-      expect(spec.paths["/v1/signup/verify"].post).toBeDefined();
+    it("includes POST /v1/signup/free (deprecated)", () => {
+      expect(spec.paths["/v1/signup/free"]).toBeDefined();
+      expect(spec.paths["/v1/signup/free"].post).toBeDefined();
+      expect(spec.paths["/v1/signup/free"].post.deprecated).toBe(true);
     });
 
     it("excludes GET /v1/billing/success (browser redirect, not public API)", () => {

src/__tests__/openapi-spec.test.ts

@@ -12,8 +12,8 @@ describe("OpenAPI spec accuracy", () => {
     expect(spec.paths).not.toHaveProperty("/v1/billing/success");
   });
 
-  it("should mark /v1/signup/verify as deprecated", () => {
-    expect(spec.paths["/v1/signup/verify"]?.post?.deprecated).toBe(true);
+  it("should mark /v1/signup/free as deprecated", () => {
+    expect(spec.paths["/v1/signup/free"]?.post?.deprecated).toBe(true);
   });
 
   describe("Rate limit headers", () => {

src/swagger.ts

@@ -163,7 +163,7 @@ const options: swaggerJsdoc.Options = {
       },
     },
   },
-  apis: ["./dist/routes/*.js", "./dist/index.js"],
+  apis: ["./src/routes/*.ts", "./src/index.ts"],
 };
 
 export const swaggerSpec = swaggerJsdoc(options);