fix(agent): include chat UI HTML in production build

Copy agent-chat.html to dist output in Dockerfile.railway and add
fallback path lookup in controller for production deployments.

Dockerfile.railway

@@ -39,6 +39,9 @@ COPY prisma /ghostfolio/dist/apps/api/prisma/
 COPY package.json /ghostfolio/dist/apps/api/
 RUN npm run database:generate-typings
 
+# Copy agent chat HTML to dist
+RUN cp /ghostfolio/apps/api/src/app/agent/agent-chat.html /ghostfolio/dist/apps/api/ 2>/dev/null || true
+
 # Runtime image
 FROM node:22-slim
 ENV NODE_ENV=production

apps/api/src/app/agent/agent.controller.ts

@@ -40,7 +40,7 @@ export class AgentController {
     const fs = require('node:fs');
     const path = require('node:path');
 
-    // Try source path first (dev), then dist path
+    // Try source path first (dev), then dist paths
     const paths = [
       path.join(
         process.cwd(),
@@ -51,7 +51,8 @@ export class AgentController {
         'agent',
         'agent-chat.html'
       ),
-      path.join(__dirname, 'agent-chat.html')
+      path.join(__dirname, 'agent-chat.html'),
+      path.join(process.cwd(), 'agent-chat.html')
     ];
 
     for (const p of paths) {