chore(githooks): simplify post-receive hook and overwrite server log

Simplify the repo toplevel detection logic and remove verbose comments from the post-receive hook. Switch next-server.log from append mode to overwrite mode so each deploy starts with a fresh log file.

.githooks/post-receive

@@ -1,41 +1,20 @@
 #!/bin/sh
 # Post-receive hook: push 后自动 build + start
 #
-# 触发场景：
-#   - 非 bare repo + receive.denyCurrentBranch=updateInstead：本地推送自动部署
-#
-# 用途：执行 package.json 中的 `build` + `start` 脚本
-#   - 实际调用 `pnpm run build`（输出丢，仅记退出码）
-#   - 再后台启 `pnpm run start`（nohup，输出丢，hook 立即返回）
-#
-# 设计：逻辑块**封**装为独立函数，main 调**度**（shell 风格）
-#   - **全**局变量：LOG_FILE（在 init_log_file **里**定**义**）、CURRENT_BRANCH
-#   - **函**数**间**通过 `$LOG_FILE` / `$BUILD_EXIT` 通信
-#   - **不**用 set -e —— 各步**自**己处理错**误**（env 不**存**在 / build 失败 / 旧**进**程**不**存**在）→ 让 deploy 错**误****不**挡 git push
 
-
-# git-receive-pack 调 hook 时 CWD **可**能是 `.git/` 内**部**，
-# `git rev-parse --show-toplevel` 会**报**错 `must be run in a work tree`。
-# 解**法**：**用** `git rev-parse --absolute-git-dir` **取**得**绝**对 .git **路**径，
-# 然后 dirname **得**到 repo **顶**层。**这**两个调**用**在 .git/ 内**部**也都**能**成**功**。
-GIT_DIR_ABS="$(git rev-parse --absolute-git-dir 2>/dev/null || true)"
-if [ -n "$GIT_DIR_ABS" ] && [ "$GIT_DIR_ABS" != ".git" ]; then
-    REPO_TOPLEVEL="$(cd "$GIT_DIR_ABS/.." && pwd)"
-else
-    REPO_TOPLEVEL="$PWD"
-fi
-cd "$REPO_TOPLEVEL" || { echo "FATAL: cannot cd to $REPO_TOPLEVEL" >&2; exit 1; }
-
-# 同 .bashrc **里**的 NVM **加**载逻辑
+# pnpm 环境变量
 export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
 [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
 
+REPO_TOPLEVEL="$(git rev-parse --show-toplevel 2>/dev/null || echo "$PWD")"
+cd "$REPO_TOPLEVEL" || { echo "FATAL: cannot cd to $REPO_TOPLEVEL" >&2; exit 1; }
+
 # ============================================================
 # 1. init_log_file —— 定**义** LOG_FILE + 创**建** logs/ 目**录**
 # ============================================================
 init_log_file() {
-    LOG_FILE="$(git rev-parse --show-toplevel)/logs/post-receive.log"
+    LOG_FILE="$REPO_TOPLEVEL/logs/post-receive.log"
     mkdir -p "$(dirname "$LOG_FILE")"
 }
 
@@ -116,10 +95,10 @@ stop_existing_next() {
 # 6. launch_next —— 后**台**启 `pnpm run start`，捕 PID
 # ============================================================
 launch_next() {
-    # next stdout/stderr 接**到** logs/next-server.log（**追**加**模式**，**保**留**历**史** log **用**于排**查**）
+    # next stdout/stderr 接**到** logs/next-server.log（**覆**盖**模式**，**每**次 deploy **重**新**开**始）
     NEXT_LOG_FILE="$REPO_TOPLEVEL/logs/next-server.log"
     echo "=== start LAUNCH @ $(date -u +%Y-%m-%dT%H:%M:%SZ) ===" >> "$LOG_FILE"
-    nohup pnpm run start >> "$NEXT_LOG_FILE" 2>&1 &
+    nohup pnpm run start > "$NEXT_LOG_FILE" 2>&1 &
     START_PID=$!
     echo "=== start PID=$START_PID @ $(date -u +%Y-%m-%dT%H:%M:%SZ) ===" >> "$LOG_FILE"
 }