(docs): add CLAUDE.md with project instructions

CLAUDE.md

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+# Appwrite Console
+
+SvelteKit web dashboard for Appwrite. Manages projects, databases, functions, auth, storage, and messaging.
+
+## Commands
+
+| Command | Purpose |
+|---------|---------|
+| `pnpm dev` | Start dev server (Vite) |
+| `pnpm build` | Production build |
+| `pnpm check` | Svelte type checking |
+| `pnpm format` | Format with Prettier |
+| `pnpm clean` | Clean build artifacts |
+
+## Stack
+
+- SvelteKit + TypeScript
+- Vite for bundling
+- Appwrite Pink design system (`@appwrite.io/pink-svelte`)
+- CodeMirror for code editing
+- Prettier for formatting, svelte-check for type checking
+
+## Architecture
+
+- `src/routes/` — SvelteKit file-based routing
+- `src/lib/` — shared components, stores, helpers
+- `src/lib/stores/` — Svelte stores for app state
+- Uses Appwrite SDK for all backend communication
+
+## Cross-repo context
+
+The `feat-dedicated-db` feature spans cloud, edge, and console. When modifying API contracts or response models, check the other repos for breaking changes.