system: information panel and event log; about: download this build's source

System page laid out after 3CX's admin dashboard: a System information panel (version,
host name, company, public IP, LAN IPs, ports, telephony, restart needed, copy buttons,
how to restart) and an Event log panel (system_events, 90 days: trunk down/up, Asterisk
down/up, restart needed, config failed, 911, public IP changed, backups, disk) with Load
more and a CSV download.

About (/about, no sign-in, linked from the login page, My phone and System): AGPL-3.0
notice, credits, the repository link, and "Code v<version>", which downloads
selfphone.tar.gz: the api image now tars its own build context (no .env, data,
node_modules, build output or .git) before installing anything.

Task: M11-T7

apps/api/src/db/migrations/0004_system_events.sql

@@ -0,0 +1,11 @@
+CREATE TABLE "system_events" (
+	"id" bigserial PRIMARY KEY NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"severity" text NOT NULL,
+	"code" text NOT NULL,
+	"source" text NOT NULL,
+	"message" text NOT NULL,
+	CONSTRAINT "system_events_severity_check" CHECK ("system_events"."severity" in ('info', 'warning', 'error'))
+);
+--> statement-breakpoint
+CREATE INDEX "system_events_created_at_index" ON "system_events" USING btree ("created_at");

apps/api/src/db/migrations/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1792439261267,
       "tag": "0003_users_totp",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1792512298128,
+      "tag": "0004_system_events",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/db/schema.ts

@@ -658,6 +658,24 @@ export const emergencyEvents = pgTable('emergency_events', {
   ...timestamps,
 });
 
+/** System page's event log: what the system noticed (trunks, telephony, backups…), not admin edits. */
+export const systemEvents = pgTable(
+  'system_events',
+  {
+    id: bigserial({ mode: 'number' }).primaryKey(),
+    createdAt: createdAt(),
+    severity: text().notNull(),
+    /** Stable id of the kind of event, e.g. trunk.down. */
+    code: text().notNull(),
+    source: text().notNull(),
+    message: text().notNull(),
+  },
+  (t) => [
+    index().on(t.createdAt),
+    check('system_events_severity_check', sql`${t.severity} in ('info', 'warning', 'error')`),
+  ],
+);
+
 export const auditLog = pgTable('audit_log', {
   id: bigserial({ mode: 'number' }).primaryKey(),
   createdAt: createdAt(),