feat(mvp): phase 1 - project scaffolding & tooling

Initialize SvelteKit project with Svelte 5, TypeScript strict, Tailwind CSS v4,
shadcn-svelte, Prisma + SQLite, Vitest, ESLint, Prettier. Add Docker multi-stage
build, docker-compose, and Gitea Actions CI pipeline.

vite.config.ts

@@ -0,0 +1,13 @@
+import tailwindcss from '@tailwindcss/vite';
+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+	plugins: [tailwindcss(), sveltekit()],
+	test: {
+		include: ['src/**/*.{test,spec}.{js,ts}'],
+		environment: 'jsdom',
+		globals: true,
+		setupFiles: []
+	}
+});