chore: initial commit (Ausgangszustand der Vorlage)

docs/production/error-tracking.md

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+# Error Tracking Setup (Sentry)
+
+Track production errors automatically so you know about issues before your users report them.
+
+## Setup (5 minutes)
+
+### 1. Create Sentry Account
+- Go to [sentry.io](https://sentry.io) (free tier available for small apps)
+- Create a new project and select "Next.js"
+
+### 2. Install Next.js Integration
+```bash
+npx @sentry/wizard@latest -i nextjs
+```
+This automatically:
+- Installs `@sentry/nextjs`
+- Creates `sentry.client.config.ts` and `sentry.server.config.ts`
+- Updates `next.config.ts` with Sentry webpack plugin
+
+### 3. Add Environment Variables
+Add to `.env.local` (local) and Vercel Dashboard (production):
+```bash
+SENTRY_DSN=https://xxx@xxx.ingest.sentry.io/xxx
+NEXT_PUBLIC_SENTRY_DSN=https://xxx@xxx.ingest.sentry.io/xxx
+SENTRY_AUTH_TOKEN=sntrys_xxx  # For source maps upload
+```
+
+### 4. Verify Setup
+Trigger a test error and check Sentry Dashboard:
+```typescript
+// Temporary test - remove after verification
+throw new Error("Sentry test error")
+```
+
+## What You Get
+- Automatic error capture (client + server)
+- Stack traces with source maps
+- Error grouping and deduplication
+- Email alerts for new errors
+- Performance monitoring (optional)
+
+## Alternative
+**Vercel Error Tracking** - Built-in, simpler, but fewer features. Available in Vercel Dashboard under "Monitoring".