ci: rewrite CI/CD with semantic-release and GHCR Docker push

- Rewrite release.yml: semantic-release for auto-versioning + Docker
  image build and push to GitHub Container Registry (ghcr.io)
- Rewrite ci.yml: remove continue-on-error on lint
- Add .releaserc.json with changelog and git plugins
- Add semantic-release dependencies to package.json
- Fix Dockerfile: remove --frozen-lockfile from production install
- Update .dockerignore with comprehensive exclusions
- Update docker-compose.yml to pull from GHCR by default
- Remove obsolete pnpm packageManager field
- Remove obsolete kubernetes.yaml from .gitignore

Dockerfile

@@ -1,33 +1,26 @@
 # ---- Stage 1: Frontend Builder ----
-FROM oven/bun:1 as frontend-builder
+FROM oven/bun:1 AS frontend-builder
 
 WORKDIR /app/frontend
 
-# 拷贝前端的 package.json 和 lockfile
 COPY frontend/package.json frontend/bun.lock* ./
 
-# 安装前端依赖
 RUN bun install --frozen-lockfile
 
-# 拷贝所有前端代码
 COPY frontend/ .
 
-# 构建前端静态文件
 RUN bun run build
 
 
 # ---- Stage 2: Backend Builder ----
-FROM oven/bun:1 as backend-builder
+FROM oven/bun:1 AS backend-builder
 
 WORKDIR /app
 
-# 拷贝后端的 package.json 和 lockfile
 COPY package.json bun.lock* ./
 
-# 只安装生产环境依赖
-RUN bun install --frozen-lockfile --production
+RUN bun install --production
 
-# 拷贝所有后端代码
 COPY src ./src
 COPY tsconfig.json .
 
@@ -37,16 +30,13 @@ FROM oven/bun:1-slim
 
 WORKDIR /app
 
-# 从后端构建器拷贝依赖和代码
 COPY --from=backend-builder /app/node_modules ./node_modules
 COPY --from=backend-builder /app/src ./src
 COPY --from=backend-builder /app/package.json .
 COPY --from=backend-builder /app/tsconfig.json .
 
-# 从前端构建器拷贝构建好的静态文件到 public 目录
 COPY --from=frontend-builder /app/frontend/dist ./public
 
 EXPOSE 3000
 
-# 启动服务
 CMD ["bun", "run", "start"]