chore: initial project scaffold

Set up Mangalord with a Rust/axum backend, SvelteKit frontend, Postgres,
and Docker Compose deployment. Establishes the architecture and TDD
patterns the project will extend:

- Hexagonal-ish backend layering (domain / repo / storage / api) with
  a pluggable Storage trait (LocalStorage today, S3 as a future impl).
- Initial migration: users, mangas, chapters, bookmarks.
- Vertical slice for mangas (list, search, create, get) with
  #[sqlx::test] integration coverage and storage unit tests.
- SvelteKit frontend using Svelte 5 runes, typed API client, Vitest
  unit tests and Playwright e2e with route mocking.
- CLAUDE.md documenting layering, TDD/git/SemVer workflow rules, and
  extension points (tags, fulltext search, OCR, S3, auth).
- Project-scoped .claude/settings.json with permission allowlist for
  the toolchain (git, cargo, npm/vite, docker, psql, gh, doc fetches).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/playwright.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+    testDir: 'e2e',
+    timeout: 30_000,
+    use: {
+        baseURL: process.env.E2E_BASE_URL ?? 'http://localhost:5173',
+        trace: 'retain-on-failure'
+    },
+    webServer: process.env.E2E_BASE_URL
+        ? undefined
+        : {
+              command: 'npm run dev',
+              port: 5173,
+              reuseExistingServer: !process.env.CI,
+              timeout: 120_000
+          }
+});