feat: add users and templates routes, enhance existing API routes

New routes:
- GET /users — list all users
- GET/POST /templates — list and create templates
- PATCH /templates/:id — update template
- POST /templates/preview — render template with ticket/demo context

Enhanced routes:
- tickets: custom field support on create, status classification helper
- custom-fields: PATCH endpoint, auto-generate short key from name
- lifecycles: PATCH endpoint
- queues: PATCH endpoint

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/routes/lifecycles.ts

@@ -2,7 +2,7 @@ import { Hono } from 'hono';
 import { HTTPException } from 'hono/http-exception';
 import type { Db } from '../db/index.ts';
 import { lifecycles } from '../db/schema.ts';
-import { asc } from 'drizzle-orm';
+import { asc, eq } from 'drizzle-orm';
 
 export function createLifecyclesRouter(db: Db): Hono {
   const router = new Hono();
@@ -34,5 +34,29 @@ export function createLifecyclesRouter(db: Db): Hono {
     return c.json(lifecycle, 201);
   });
 
+  router.patch('/:id', async (c) => {
+    const id = c.req.param('id');
+    const body = await c.req.json();
+
+    const existing = await db.query.lifecycles.findFirst({
+      where: eq(lifecycles.id, id),
+    });
+
+    if (!existing) {
+      throw new HTTPException(404, { message: 'Lifecycle not found' });
+    }
+
+    const updateData: Partial<typeof lifecycles.$inferInsert> = {};
+    if (body.name !== undefined) updateData.name = String(body.name);
+    if (body.definition !== undefined) updateData.definition = body.definition;
+
+    const [updated] = await db.update(lifecycles)
+      .set(updateData)
+      .where(eq(lifecycles.id, id))
+      .returning();
+
+    return c.json(updated);
+  });
+
   return router;
 }