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.

Dockerfile

@@ -0,0 +1,40 @@
+# Stage 1: Install dependencies
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Stage 2: Build the application
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN npx prisma generate
+RUN npm run build
+RUN npm prune --production
+
+# Stage 3: Production image
+FROM node:22-alpine AS production
+WORKDIR /app
+
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
+COPY --from=build /app/build ./build
+COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/package.json ./
+COPY --from=build /app/prisma ./prisma
+
+RUN mkdir -p /app/data && chown -R appuser:appgroup /app
+
+USER appuser
+
+ENV NODE_ENV=production
+ENV APP_PORT=3000
+ENV APP_HOST=0.0.0.0
+
+EXPOSE 3000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+	CMD wget -qO- http://localhost:3000/api/health || exit 1
+
+CMD ["node", "build"]