refactor(routes): Phase 3.3 - standardize health.js with explicit dependencies

- Replaced god object ctx with explicit dependency injection
- Added JSDoc documenting required dependencies (8 deps vs 50+)
- Updated response calls to use response-helpers (success/error)
- Self-documenting: you can see exactly what this route needs
- Health checks, pylon relay, CA cert validation all preserved

dashcaddy-api/server.js

@@ -1207,7 +1207,16 @@ apiRouter.use(serviceRoutes({
   caddy: ctx.caddy,
   dns: ctx.dns
 }));
-apiRouter.use(healthRoutes(ctx));
+apiRouter.use(healthRoutes({
+  fetchT: ctx.fetchT,
+  SERVICES_FILE: ctx.SERVICES_FILE,
+  servicesStateManager: ctx.servicesStateManager,
+  siteConfig: ctx.siteConfig,
+  buildServiceUrl: ctx.buildServiceUrl,
+  asyncHandler: ctx.asyncHandler,
+  logError: ctx.logError,
+  healthChecker: ctx.healthChecker
+}));
 apiRouter.use(monitoringRoutes(ctx));
 apiRouter.use(updatesRoutes(ctx));
 apiRouter.use('/tailscale', tailscaleRoutes(ctx));