feat(onboarding/phase-1): admin-editable telephony, ai, and setup-state config

Phase 1 of hospital onboarding & self-service plan
(docs/superpowers/plans/2026-04-06-hospital-onboarding-self-service.md).

Backend foundations to support the upcoming staff-portal Settings hub and
6-step setup wizard. No frontend in this phase.

New config services (mirroring ThemeService / WidgetConfigService):
- SetupStateService    — tracks completion of 6 wizard steps; isWizardRequired()
                         drives the post-login redirect
- TelephonyConfigService — Ozonetel + Exotel + SIP, replaces 8 env vars,
                           seeds from env on first boot, masks secrets on GET,
                           '***masked***' sentinel on PUT means "keep existing"
- AiConfigService      — provider, model, temperature, system prompt addendum;
                         API keys remain in env

New endpoints under /api/config:
- GET  /api/config/setup-state                returns state + wizardRequired flag
- PUT  /api/config/setup-state/steps/:step    mark step complete/incomplete
- POST /api/config/setup-state/dismiss        dismiss wizard
- POST /api/config/setup-state/reset
- GET  /api/config/telephony                  masked
- PUT  /api/config/telephony
- POST /api/config/telephony/reset
- GET  /api/config/ai
- PUT  /api/config/ai
- POST /api/config/ai/reset

ConfigThemeModule is now @Global() so the new sidecar config services are
injectable from AuthModule, OzonetelAgentModule, MaintModule without creating
a circular dependency (ConfigThemeModule already imports AuthModule for
SessionService).

Migrated 11 env-var read sites to use the new services:
- ozonetel-agent.service: exotel API + ozonetel did/sipId via read-through getters
- ozonetel-agent.controller: defaultAgentId/Password/SipId via getters
- kookoo-ivr.controller: sipId/callerId via getters
- auth.controller: OZONETEL_AGENT_PASSWORD (login + logout)
- agent-config.service: sipDomain/wsPort/campaignName via getters
- maint.controller: forceReady + unlockAgent
- ai-provider: createAiModel and isAiConfigured refactored to pure factories
  taking AiProviderOpts; no more ConfigService dependency
- widget-chat.service, recordings.service, ai-enrichment.service,
  ai-chat.controller, ai-insight.consumer, call-assist.service: each builds
  the AI model from AiConfigService.getConfig() + ConfigService API keys

Hot-reload guarantee: every consumer reads via a getter or builds per-call,
so admin updates take effect without sidecar restart. WidgetChatService
specifically rebuilds the model on each streamReply().

Bug fix bundled: dropped widget.json.hospitalName field (the original
duplicate that started this whole thread). WidgetConfigService now reads
brand.hospitalName from ThemeService at the 2 generateKey call sites.
Single source of truth for hospital name is workspace branding.

First-boot env seeding: TelephonyConfigService and AiConfigService both
copy their respective env vars into a fresh data/*.json on onModuleInit if
the file doesn't exist. Existing deployments auto-migrate without manual
intervention.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/config/setup-state.controller.ts

@@ -0,0 +1,48 @@
+import { Body, Controller, Get, Logger, Param, Post, Put } from '@nestjs/common';
+import { SetupStateService } from './setup-state.service';
+import type { SetupStepName } from './setup-state.defaults';
+
+// Public endpoint family for the onboarding wizard. Mounted under /api/config
+// alongside theme/widget. No auth guard yet — matches existing convention with
+// ThemeController. To be tightened when the staff portal admin auth is in place.
+//
+//   GET  /api/config/setup-state                     full state + isWizardRequired
+//   PUT  /api/config/setup-state/steps/:step         { completed: bool, completedBy?: string }
+//   POST /api/config/setup-state/dismiss             dismiss the wizard for this workspace
+//   POST /api/config/setup-state/reset               reset all steps to incomplete (admin)
+@Controller('api/config')
+export class SetupStateController {
+    private readonly logger = new Logger(SetupStateController.name);
+
+    constructor(private readonly setupState: SetupStateService) {}
+
+    @Get('setup-state')
+    getState() {
+        const state = this.setupState.getState();
+        return {
+            ...state,
+            wizardRequired: this.setupState.isWizardRequired(),
+        };
+    }
+
+    @Put('setup-state/steps/:step')
+    updateStep(
+        @Param('step') step: SetupStepName,
+        @Body() body: { completed: boolean; completedBy?: string },
+    ) {
+        if (body.completed) {
+            return this.setupState.markStepCompleted(step, body.completedBy ?? null);
+        }
+        return this.setupState.markStepIncomplete(step);
+    }
+
+    @Post('setup-state/dismiss')
+    dismiss() {
+        return this.setupState.dismissWizard();
+    }
+
+    @Post('setup-state/reset')
+    reset() {
+        return this.setupState.resetState();
+    }
+}