docs: Add model setup documentation and script

- Add models/README.md with model file information
- Add scripts/setup-models.sh for easy model linking
- Document how to obtain and setup model files

models/README.md

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+# 模型文件目录
+
+此目录用于存放 AI 检测模型文件。
+
+## 模型清单
+
+| 模型 | 文件名 | 来源 | 大小 |
+|------|--------|------|------|
+| 火灾检测 | `fire_detection/best.pt` | fire_detection/models/best.pt | ~61MB |
+| 安全帽检测 | `helmet_detection/yolov8n.pt` | yolov/yolov8n.pt | ~6MB |
+| 人群检测 | `crowd_detection/yolov8l.pt` | behavior_detection/Crowd-Gathering/models/yolov8l.pt | ~100MB |
+| 抽烟检测 | `smoking_detection/smoking_yolov8n.pt` | behavior_detection/smoker-detection/models/smoking_yolov8n.pt | ~6MB |
+| 徘徊检测 | `loitering_detection/yolov8n.pt` | behavior_detection/Loitering-Detection/yolov8n.pt | ~6MB |
+
+## 设置模型
+
+### 方式1: 符号链接（开发环境）
+```bash
+# 在项目根目录执行
+ln -sf /path/to/fire_detection/models/best.pt models/fire_detection/
+ln -sf /path/to/yolov/yolov8n.pt models/helmet_detection/
+ln -sf /path/to/behavior_detection/Crowd-Gathering/models/yolov8l.pt models/crowd_detection/
+ln -sf /path/to/behavior_detection/smoker-detection/models/smoking_yolov8n.pt models/smoking_detection/
+ln -sf /path/to/behavior_detection/Loitering-Detection/yolov8n.pt models/loitering_detection/
+```
+
+### 方式2: 复制文件
+```bash
+cp /path/to/fire_detection/models/best.pt models/fire_detection/
+cp /path/to/yolov/yolov8n.pt models/helmet_detection/
+cp /path/to/behavior_detection/Crowd-Gathering/models/yolov8l.pt models/crowd_detection/
+cp /path/to/behavior_detection/smoker-detection/models/smoking_yolov8n.pt models/smoking_detection/
+cp /path/to/behavior_detection/Loitering-Detection/yolov8n.pt models/loitering_detection/
+```
+
+### 方式3: 使用初始化脚本
+```bash
+bash scripts/setup-models.sh
+```
+
+## 注意
+
+模型文件较大，未包含在 Git 仓库中。请从原始位置复制或创建符号链接。

scripts/setup-models.sh

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+#!/bin/bash
+
+# 模型文件设置脚本
+
+set -e
+
+echo "🔗 设置模型文件链接..."
+
+cd "$(dirname "$0")/.."
+
+# 创建模型目录
+mkdir -p models/{fire_detection,helmet_detection,crowd_detection,smoking_detection,loitering_detection}
+
+# 获取项目根目录的父目录（video-model）
+PARENT_DIR="$(cd .. && pwd)"
+
+echo "📁 父目录: $PARENT_DIR"
+
+# 火灾检测模型
+if [ ! -L "models/fire_detection/best.pt" ]; then
+    if [ -f "$PARENT_DIR/fire_detection/models/best.pt" ]; then
+        ln -sf "$PARENT_DIR/fire_detection/models/best.pt" models/fire_detection/
+        echo "✅ 火灾检测模型链接已创建"
+    else
+        echo "⚠️  火灾检测模型未找到: $PARENT_DIR/fire_detection/models/best.pt"
+    fi
+else
+    echo "✓ 火灾检测模型链接已存在"
+fi
+
+# 安全帽检测模型
+if [ ! -L "models/helmet_detection/yolov8n.pt" ]; then
+    if [ -f "$PARENT_DIR/yolov/yolov8n.pt" ]; then
+        ln -sf "$PARENT_DIR/yolov/yolov8n.pt" models/helmet_detection/
+        echo "✅ 安全帽检测模型链接已创建"
+    else
+        echo "⚠️  安全帽检测模型未找到: $PARENT_DIR/yolov/yolov8n.pt"
+    fi
+else
+    echo "✓ 安全帽检测模型链接已存在"
+fi
+
+# 人群检测模型
+if [ ! -L "models/crowd_detection/yolov8l.pt" ]; then
+    if [ -f "$PARENT_DIR/behavior_detection/Crowd-Gathering/models/yolov8l.pt" ]; then
+        ln -sf "$PARENT_DIR/behavior_detection/Crowd-Gathering/models/yolov8l.pt" models/crowd_detection/
+        echo "✅ 人群检测模型链接已创建"
+    else
+        echo "⚠️  人群检测模型未找到: $PARENT_DIR/behavior_detection/Crowd-Gathering/models/yolov8l.pt"
+    fi
+else
+    echo "✓ 人群检测模型链接已存在"
+fi
+
+# 抽烟检测模型
+if [ ! -L "models/smoking_detection/smoking_yolov8n.pt" ]; then
+    if [ -f "$PARENT_DIR/behavior_detection/smoker-detection/models/smoking_yolov8n.pt" ]; then
+        ln -sf "$PARENT_DIR/behavior_detection/smoker-detection/models/smoking_yolov8n.pt" models/smoking_detection/
+        echo "✅ 抽烟检测模型链接已创建"
+    else
+        echo "⚠️  抽烟检测模型未找到: $PARENT_DIR/behavior_detection/smoker-detection/models/smoking_yolov8n.pt"
+    fi
+else
+    echo "✓ 抽烟检测模型链接已存在"
+fi
+
+# 徘徊检测模型
+if [ ! -L "models/loitering_detection/yolov8n.pt" ]; then
+    if [ -f "$PARENT_DIR/behavior_detection/Loitering-Detection/yolov8n.pt" ]; then
+        ln -sf "$PARENT_DIR/behavior_detection/Loitering-Detection/yolov8n.pt" models/loitering_detection/
+        echo "✅ 徘徊检测模型链接已创建"
+    else
+        echo "⚠️  徘徊检测模型未找到: $PARENT_DIR/behavior_detection/Loitering-Detection/yolov8n.pt"
+    fi
+else
+    echo "✓ 徘徊检测模型链接已存在"
+fi
+
+echo ""
+echo "✅ 模型设置完成！"
+echo ""
+echo "📋 模型状态:"
+ls -la models/*/