Add 1d/7d/all time-range filter to admin by-model stats

By-model panel gains a segmented 1天/7天/全部 control. Selecting a
range fetches /api/stats?since=<RFC3339> and re-renders only that table
client-side, replicating the human/rate template helpers in JS; the
existing /api/stats since param already drives the server-side filter.

- internal/server/templates/admin.html: filter UI + JS, empty/loading states
- internal/server/server_test.go: render test for the filter controls
- scripts/test-instance.sh: build→start→stop→clean test-instance helper

scripts/test-instance.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+# 实例测试流程固化脚本
+#
+#   ./scripts/test-instance.sh start    # 编译新二进制 + 以当前目录 zhanlu.db 启动
+#   ./scripts/test-instance.sh stop     # 停止进程 + 清理 *-shm/*-wal
+#   ./scripts/test-instance.sh status   # 查看运行状态
+#
+# 可用环境变量覆盖默认值:
+#   ZHANLU_DB_FILE       数据库路径        (默认 <项目根>/zhanlu.db)
+#   ZHANLU_LISTEN_ADDR   监听地址          (默认 127.0.0.1:8080)
+set -euo pipefail
+
+# 项目根目录(脚本位于 scripts/ 下)
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+WORKDIR="$ROOT/tmp"                       # 二进制/pid/log 都放这里(已 gitignore)
+BIN="$WORKDIR/zhanlu-proxy-test"
+PIDFILE="$WORKDIR/test-instance.pid"
+LOGFILE="$WORKDIR/test-instance.log"
+DB="${ZHANLU_DB_FILE:-$ROOT/zhanlu.db}"
+ADDR="${ZHANLU_LISTEN_ADDR:-127.0.0.1:8080}"
+
+start() {
+  mkdir -p "$WORKDIR"
+  if [[ -f "$PIDFILE" ]] && kill -0 "$(cat "$PIDFILE")" 2>/dev/null; then
+    echo "已有实例在运行 (pid $(cat "$PIDFILE"))，请先执行: $0 stop" >&2
+    exit 1
+  fi
+  echo "==> 编译二进制..."
+  (cd "$ROOT" && go build -o "$BIN" ./cmd/zhanlu-proxy)
+  echo "==> 启动 (db=$DB  addr=$ADDR)"
+  ZHANLU_DB_FILE="$DB" ZHANLU_LISTEN_ADDR="$ADDR" \
+    nohup "$BIN" > "$LOGFILE" 2>&1 &
+  echo $! > "$PIDFILE"
+  sleep 1
+  if ! kill -0 "$(cat "$PIDFILE")" 2>/dev/null; then
+    echo "启动失败，日志:" >&2
+    cat "$LOGFILE" >&2
+    rm -f "$PIDFILE"
+    exit 1
+  fi
+  port="${ADDR##*:}"
+  echo "==> 已启动 pid=$(cat "$PIDFILE")"
+  echo "    管理后台: http://127.0.0.1:$port/admin"
+  echo "    日志:     $LOGFILE"
+  echo "    测试完成后执行: $0 stop"
+}
+
+stop() {
+  pid=""
+  [[ -f "$PIDFILE" ]] && pid="$(cat "$PIDFILE")"
+  if [[ -n "$pid" ]] && kill -0 "$pid" 2>/dev/null; then
+    kill "$pid" 2>/dev/null || true
+    # 优雅等待退出(给 SQLite checkpoint WAL 的时间)
+    for _ in $(seq 1 40); do
+      kill -0 "$pid" 2>/dev/null || break
+      sleep 0.25
+    done
+    if kill -0 "$pid" 2>/dev/null; then
+      echo "==> 优雅退出超时，强制结束 pid=$pid"
+      kill -9 "$pid" 2>/dev/null || true
+    else
+      echo "==> 已停止进程 pid=$pid"
+    fi
+  else
+    echo "==> 无运行中的进程"
+  fi
+  rm -f "$PIDFILE"
+  # 清理 wal/shm(与 DB 同目录同名)
+  removed=0
+  for ext in db-shm db-wal; do
+    f="${DB%.*}.$ext"
+    if [[ -f "$f" ]]; then
+      rm -f "$f"
+      echo "==> 已清理 $f"
+      removed=1
+    fi
+  done
+  [[ $removed -eq 0 ]] && echo "==> 无 shm/wal 需清理"
+  rm -f "$BIN"
+  echo "==> 完成"
+}
+
+status() {
+  if [[ -f "$PIDFILE" ]] && kill -0 "$(cat "$PIDFILE")" 2>/dev/null; then
+    echo "运行中 pid=$(cat "$PIDFILE")  addr=$ADDR  db=$DB"
+  else
+    echo "未运行"
+  fi
+}
+
+case "${1:-}" in
+  start)  start ;;
+  stop)   stop ;;
+  status) status ;;
+  *) echo "用法: $0 {start|stop|status}" >&2; exit 1 ;;
+esac