feat: add lab SQLite migrate, LiteLLM env, and OTEL/Grafana stack

Enable local workshop readiness with executable SQLite migrations, OpenTelemetry hello signals, and a provisioned Grafana demo dashboard over Tempo/Loki/Prometheus.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/env.ts

@@ -0,0 +1,20 @@
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+/** Load `.env` into process.env without overriding existing vars. */
+export function loadDotEnv(cwd = process.cwd()): void {
+  try {
+    const text = readFileSync(join(cwd, ".env"), "utf8");
+    for (const line of text.split(/\r?\n/)) {
+      const trimmed = line.trim();
+      if (!trimmed || trimmed.startsWith("#")) continue;
+      const i = trimmed.indexOf("=");
+      if (i <= 0) continue;
+      const key = trimmed.slice(0, i).trim();
+      const value = trimmed.slice(i + 1).trim();
+      if (process.env[key] === undefined) process.env[key] = value;
+    }
+  } catch {
+    // optional .env
+  }
+}