feat(lsp): add Python language server support

- Add pyright-langserver for Python LSP support
- Add environment variable overrides for Python LSP configuration
- Install git in Docker image (required for gopls dependency resolution)
- Optimize Go binary build with -s -w linker flags for smaller image
- Add GOPROXY configuration for faster dependency downloads
- Update Node.js installation method with GPG key verification
- Add entrypoint script to auto-create go.mod in workspace
- Add /app/logs volume for log persistence

backend/Dockerfile

@@ -1,10 +1,4 @@
 # syntax=docker/dockerfile:1
-###############################################################################
-# All-in-one LSP Gateway Image
-#   - Go        → gopls
-#   - JS / TS   → typescript-language-server
-#   - Java      → Eclipse JDT Language Server (jdtls) + JDK 22
-###############################################################################
 
 # ── Stage 1: Build Go gateway binary ────────────────────────────────────────
 FROM golang:1.25-bookworm AS builder
@@ -12,46 +6,64 @@ WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
+# 优化：去除符号表(-s -w)减小体积，CGO_ENABLED=0 确保静态链接
 RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/server ./cmd/server
 
 # ── Stage 2: Build gopls ────────────────────────────────────────────────────
 FROM golang:1.25-bookworm AS gopls-builder
-RUN go install golang.org/x/tools/gopls@latest
+# 优化：静态编译 gopls，避免 GLIBC 版本依赖问题
+RUN CGO_ENABLED=0 go install golang.org/x/tools/gopls@latest
 
 # ── Stage 3: Runtime ────────────────────────────────────────────────────────
 FROM eclipse-temurin:22-jdk-noble
 
 ARG NODE_MAJOR=22
 
-# ---- System deps: Node.js, python3 (jdtls launcher) ----
+# ---- System deps ----
+# 🔴 关键修复：必须安装 git，否则 gopls 无法拉取依赖
+# python3: JDTLS 需要
+# nodejs: TS Server 需要
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends ca-certificates curl python3 && \
-    curl -fsSL https://deb.nodesource.com/setup_${NODE_MAJOR}.x | bash - && \
+    apt-get install -y --no-install-recommends \
+    ca-certificates \
+    curl \
+    python3 \
+    git \
+    gnupg && \
+    mkdir -p /etc/apt/keyrings && \
+    curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg && \
+    echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_${NODE_MAJOR}.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list && \
+    apt-get update && \
     apt-get install -y --no-install-recommends nodejs && \
+    apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-# ---- typescript-language-server (covers JavaScript + TypeScript) ----
-RUN npm install -g typescript-language-server typescript && \
+# ---- typescript-language-server + pyright (Python LSP) ----
+RUN npm install -g typescript-language-server typescript pyright && \
     npm cache clean --force
 
-# ---- Go toolchain (gopls needs it at runtime for analysis) ----
+# ---- Go toolchain (Optimized) ----
 COPY --from=golang:1.25-bookworm /usr/local/go /usr/local/go
+
+
+# 🟡 建议：设置 GOPROXY 加速依赖下载 (gopls 需要)
 ENV PATH="/usr/local/go/bin:/go/bin:${PATH}" \
-    GOPATH="/go"
+    GOPATH="/go" \
+    GOPROXY="https://goproxy.io,direct"
 
 # ---- gopls ----
 COPY --from=gopls-builder /go/bin/gopls /go/bin/gopls
 
 # ---- Eclipse JDT Language Server ----
+# !!! 请确保当前目录下有这个文件夹 !!!
 COPY jdt-language-server-1.57.0-202602111032 /opt/jdtls
 RUN chmod +x /opt/jdtls/bin/jdtls /opt/jdtls/bin/jdtls.py
 
-# ---- Gateway binary ----
+# ---- Gateway Setup ----
 WORKDIR /app
 COPY --from=builder /out/server /app/server
-COPY config.example.json /app/config.example.json
 
-# ---- Default config: all 4 LSP servers, Redis/Nacos off by default ----
+# ---- 默认配置 ----
 COPY <<'EOF' /app/config.json
 {
   "port": "8080",
@@ -62,28 +74,35 @@ COPY <<'EOF' /app/config.json
   "cleanupInterval": "2m",
   "maxSessions": 256,
   "enableRedis": false,
-  "enableNacosRegister": false,
   "appEnv": "prod",
   "logLevel": "info",
   "logConsoleEnabled": true,
+  "logDir": "/app/logs",
   "servers": [
-    { "language": "go",         "languageId": "go",         "command": "gopls",                     "args": [] },
+    { "language": "go",         "languageId": "go",         "command": "gopls",                      "args": [] },
     { "language": "javascript", "languageId": "javascript", "command": "typescript-language-server", "args": ["--stdio"] },
     { "language": "typescript", "languageId": "typescript", "command": "typescript-language-server", "args": ["--stdio"] },
-    { "language": "java",       "languageId": "java",       "command": "/opt/jdtls/bin/jdtls",      "args": [] }
+    { "language": "java",       "languageId": "java",       "command": "/opt/jdtls/bin/jdtls",       "args": [] },
+    { "language": "python",     "languageId": "python",     "command": "pyright-langserver",          "args": ["--stdio"] }
   ]
 }
 EOF
 
-# ---- Directories & non-root user ----
-RUN mkdir -p /workspace /go && \
+# ---- 权限与目录 ----
+RUN mkdir -p /workspace /go /app/logs && \
     groupadd --system app && \
     useradd --system --gid app --home-dir /home/app --create-home app && \
-    chown -R app:app /app /workspace /go /home/app
+    chown -R app:app /app /workspace /go /home/app /app/logs
 
 ENV PORT=8080 \
     WORKSPACE_DIR=/workspace
+
+VOLUME ["/app/logs"]
+
 EXPOSE 8080
 
 USER app
-ENTRYPOINT ["/app/server"]
+
+# 🔴 关键：用 entrypoint 脚本在启动时写 go.mod，避免被 volume 挂载覆盖
+# 如果 /workspace 下还没有 go.mod，自动创建一个最小的
+ENTRYPOINT ["sh", "-c", "test -f /workspace/go.mod || printf 'module workspace\n\ngo 1.25\n' > /workspace/go.mod; exec /app/server"]