docs: add Sub-Dokumentation section to AGENTS.md and CLAUDE.md for improved documentation structure

- Introduced a new section detailing the Single Source of Truth for various components, linking to their respective CLAUDE.md files.
- Enhanced clarity on documentation organization across different areas of the project.
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# app/ — Next.js Routing & Layouts
Next.js 16 App Router. Vor Änderungen: Relevante Guides in `node_modules/next/dist/docs/` lesen — Breaking Changes gegenüber früheren Versionen möglich.
---
## Route-Struktur
```
app/
├── layout.tsx ← Root Layout (Fonts, Providers, Sentry, Analytics)
├── page.tsx ← Landing / Redirect
├── globals.css ← Tailwind v4 + Design-Tokens
├── (app)/ ← Authentifizierte App-Routen
│ ├── canvas/[canvasId]/ ← Canvas-Editor
│ │ └── page.tsx
│ └── settings/
│ └── billing/ ← Billing-Einstellungen
├── auth/ ← Auth-Routen (Better Auth)
│ ├── [path]/ ← Catch-all für Better Auth Flows
│ ├── sign-in/
│ └── sign-up/
├── api/
│ ├── auth/[...all]/ ← Better Auth API Handler
│ └── pexels-video/ ← Pexels Video Proxy
└── dashboard/ ← Dashboard nach Login
```
---
## Root Layout (`layout.tsx`)
Server Component. Initialisiert:
1. **Font:** `Manrope` via `next/font/google` → CSS-Variable `--font-sans`
2. **Auth:** `getToken()` + `getAuthUser()` für SSR-seitigen Convex-Token
3. **Sentry:** `Sentry.setUser()` direkt im Layout (serverseitig)
4. **Analytics:** Rybbit-Script via `<script>` Tag (`rybbit.matthias.lol`)
5. **Providers:** `<Providers initialToken={...}>` — Convex + Theme + Auth
6. **InitUser:** `<InitUser />` — Ruft `api.credits.initBalance` beim ersten Login auf
---
## Provider-Pattern
```tsx
// components/providers.tsx
<ConvexProvider client={convex}>
<ThemeProvider>
<AuthProvider>
{children}
</AuthProvider>
</ThemeProvider>
</ConvexProvider>
```
`initialToken` wird server-seitig aus Better Auth ausgelesen und an Convex übergeben — verhindert einen Auth-Flash beim ersten Render. Mit `initialToken` springt `isAuthenticated` sofort auf `true` ohne Loading-Phase.
---
## Auth-Flow
**Better Auth** (self-hosted, open-source). Konfiguration in `lib/auth.ts` (Server) und `lib/auth-client.ts` (Client).
- Server-Helper: `getAuthUser()`, `getToken()` aus `lib/auth-server.ts`
- Client-Helper: `authClient` aus `lib/auth-client.ts`
- Convex-Integration: `convex/auth.config.ts` + `convex/auth.ts`
- Trusted Origins: `https://app.lemonspace.io`, `http://localhost:3000`
---
## Route Groups
`(app)/` — Klammer-Gruppen teilen kein eigenes Layout-Segment, ermöglichen aber eigene `layout.tsx` für Auth-Guards. Alle eingeloggten Routen liegen hier.
---
## API-Routen
- `api/auth/[...all]` — Better Auth catch-all Handler. Nicht anfassen ohne Better Auth Docs zu lesen.
- `api/pexels-video` — Server-seitiger Proxy für Pexels-Video-Anfragen (API-Key bleibt serverseitig).
---
## env-Variablen (Next.js-Seite)
```
BETTER_AUTH_SECRET
BETTER_AUTH_URL
NEXT_PUBLIC_CONVEX_URL
```