feat(web,server): inference settings UI with per-session inference overrides

Adds Inference tab to SettingsPane with controls for temperature, top-p,
top-k, min-p, and other inference parameters. Server-side route and
provider config wiring to pass overrides through the inference pipeline.

apps/coder/src/index.ts

@@ -28,6 +28,7 @@ import { registerArenaRoutes } from './routes/arena.js';
 import { registerProviderRoutes } from './routes/providers.js';
 import { registerWorktreeSafetyRoutes } from './routes/worktree-safety.js';
 import { registerLifecycleRoutes } from './routes/lifecycle.js';
+import { registerAnalyticsRoutes } from './routes/analytics.js';
 import { registerWebSocket } from './routes/ws.js';
 // Phase 4: dispatcher + agent probe
 import { createDispatcher } from './services/dispatcher.js';
@@ -382,6 +383,7 @@ async function main() {
   registerProviderRoutes(app, sql, config);
   registerWorktreeSafetyRoutes(app, sql);
   registerLifecycleRoutes(app, sql);
+  registerAnalyticsRoutes(app, sql);
   registerWebSocket(app, sql, broker);
 
   // Graceful shutdown