generator: PJSIP transports, extension endpoints and rtp config

Golden cases empty, one-user, webrtc-disabled and hostile-names; each also
renders identically from shuffled input. pnpm test:asterisk boots the
asterisk image with every golden case and fails on a missing endpoint or
context or any ERROR log line (checked against a deliberately broken case).
On 24.0.0-rc2: 101 and 101-web load with every set_var.

Task: M2-T3

apps/api/src/generator/index.ts

@@ -9,6 +9,9 @@ import type { Db } from '../db/client.ts';
 import { generatorRuns } from '../db/schema.ts';
 import { getSetting, setSetting } from '../services/settings.ts';
 import { loadSnapshot, type Snapshot } from './load.ts';
+import { renderPjsip, renderRtp, renderTransports } from './pjsip.ts';
+
+export { renderTransports };
 
 export const HEADER = '; GENERATED BY SelfPhoneNG — DO NOT EDIT. Changes will be overwritten.\n';
 
@@ -29,7 +32,10 @@ export const GENERATED_FILES = Object.keys(RELOADS) as GeneratedFileName[];
 export type RenderedFiles = Record<GeneratedFileName, string>;
 
 // Each file's body; tasks fill these in (M2-T3 pjsip/rtp, M2-T4 dialplan, ...).
-const BODIES: Partial<Record<GeneratedFileName, (snap: Snapshot) => string>> = {};
+const BODIES: Partial<Record<GeneratedFileName, (snap: Snapshot) => string>> = {
+  'pjsip_selfphoneng.conf': renderPjsip,
+  'rtp_selfphoneng.conf': renderRtp,
+};
 
 /** PURE: no I/O, no clock, no randomness. Same snapshot → byte-identical files. */
 export function render(snap: Snapshot): RenderedFiles {
@@ -38,11 +44,6 @@ export function render(snap: Snapshot): RenderedFiles {
   ) as RenderedFiles;
 }
 
-/** The transport block: [global], [system] and every type=transport section (03 §3). */
-export function renderTransports(_snap: Snapshot): string {
-  return ''; // M2-T3
-}
-
 export type ApplyResult = {
   ok: boolean;
   error: string | null;