feat: enable sourcemaps for profiling in recording mode

Sourcemaps are now always enabled when starting application profiling,
providing accurate stack traces pointing to original source files in flamegraphs.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mcollina

web/backend/routes/root.ts

@@ -191,7 +191,7 @@ export default async function (fastify: FastifyInstance) {
     fastify.loaded.mode = mode
     if (mode === 'start') {
       for (const { id } of applications) {
-        await api.startApplicationProfiling(pid, id, { type })
+        await api.startApplicationProfiling(pid, id, { type, sourceMaps: true })
       }
       fastify.loaded.type = type
       fastify.loaded.metrics = {}