feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/analytics/mobile/src/providers/posthog/env.ts

@@ -0,0 +1,29 @@
+/* eslint-disable turbo/no-undeclared-env-vars */
+/* eslint-disable @typescript-eslint/no-unsafe-assignment */
+import { defineEnv } from "envin";
+import * as z from "zod";
+
+import { envConfig } from "@turbostarter/shared/constants";
+
+import type { Preset } from "envin/types";
+
+export const preset = {
+  id: "posthog",
+  clientPrefix: "EXPO_PUBLIC_",
+  client: {
+    EXPO_PUBLIC_POSTHOG_KEY: z.string(),
+    EXPO_PUBLIC_POSTHOG_HOST: z
+      .string()
+      .optional()
+      .default("https://us.i.posthog.com"),
+  },
+} as const satisfies Preset;
+
+export const env = defineEnv({
+  ...envConfig,
+  ...preset,
+  env: {
+    EXPO_PUBLIC_POSTHOG_KEY: process.env.EXPO_PUBLIC_POSTHOG_KEY,
+    EXPO_PUBLIC_POSTHOG_HOST: process.env.EXPO_PUBLIC_POSTHOG_HOST,
+  },
+});

packages/analytics/mobile/src/providers/posthog/index.tsx

@@ -0,0 +1,73 @@
+import PostHog, { PostHogProvider } from "posthog-react-native";
+import { useEffect } from "react";
+
+import { useTrackingPermissions } from "../../hooks";
+
+import { env } from "./env";
+
+import type { AnalyticsProviderClientStrategy } from "@turbostarter/analytics";
+
+let client: PostHog | null = null;
+
+const getClient = () => {
+  if (client) {
+    return client;
+  }
+
+  client = new PostHog(env.EXPO_PUBLIC_POSTHOG_KEY, {
+    host: env.EXPO_PUBLIC_POSTHOG_HOST,
+    defaultOptIn: false,
+  });
+
+  return client;
+};
+
+const Wrapper = ({ children }: { children: React.ReactNode }) => {
+  const client = getClient();
+
+  return (
+    <PostHogProvider client={client} autocapture>
+      {children}
+    </PostHogProvider>
+  );
+};
+
+const Setup = () => {
+  const client = getClient();
+  const granted = useTrackingPermissions();
+
+  useEffect(() => {
+    if (granted) {
+      void client.optIn();
+    } else {
+      void client.optOut();
+    }
+  }, [granted, client]);
+
+  return null;
+};
+
+const ProviderComponent = ({ children }: { children: React.ReactNode }) => {
+  return (
+    <Wrapper>
+      <Setup />
+      {children}
+    </Wrapper>
+  );
+};
+
+export const { Provider, track, identify, reset } = {
+  Provider: ProviderComponent,
+  track: (name, params) => {
+    const client = getClient();
+    client.capture(name, params);
+  },
+  identify: (userId, traits) => {
+    const client = getClient();
+    client.identify(userId, traits);
+  },
+  reset: () => {
+    const client = getClient();
+    client.reset();
+  },
+} satisfies AnalyticsProviderClientStrategy;