feat(gis): #21 GIS引擎集成（GeoServer+PostGIS+Leaflet）

- 创建基础目录结构和核心实体类
- 实现数据库DDL（GIS基础地图、IoT设备、管网数据）
- 实现基础GIS API端点（base-layers、devices、pipes、map-config）
- 前端组件树定义

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docs/design-spec.md

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+# GIS引擎集成设计文档
+
+## 1.4 GIS引擎集成（GeoServer+PostGIS+Leaflet）
+
+### 数据库DDL
+```sql
+-- PostGIS空间表
+CREATE TABLE gis_base_map (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    type VARCHAR(50) NOT NULL,
+    geom GEOMETRY(Polygon, 4326) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 监测点位表
+CREATE TABLE iot_device (
+    id SERIAL PRIMARY KEY,
+    device_code VARCHAR(50) UNIQUE NOT NULL,
+    name VARCHAR(100) NOT NULL,
+    device_type VARCHAR(50) NOT NULL,
+    longitude DECIMAL(10, 6) NOT NULL,
+    latitude DECIMAL(10, 6) NOT NULL,
+    gis_layer_name VARCHAR(100),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    location_geom GEOMETRY(Point, 4326)
+);
+
+-- 管网数据表
+CREATE TABLE water_pipe_network (
+    id SERIAL PRIMARY KEY,
+    pipe_code VARCHAR(50) UNIQUE NOT NULL,
+    pipe_type VARCHAR(50) NOT NULL,
+    start_point_geom GEOMETRY(Point, 4326),
+    end_point_geom GEOMETRY(Point, 4326),
+    diameter DECIMAL(10, 2),
+    material VARCHAR(50),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+```
+
+### API端点规范
+```
+GET    /api/gis/base-layers     # 获取基础图层列表
+POST   /api/gis/base-layers     # 创建基础图层
+GET    /api/gis/devices          # 获取监测点位列表
+POST   /api/gis/devices          # 添加监测点位
+GET    /api/gis/pipes            # 获取管网数据
+POST   /api/gis/pipes            # 添加管网数据
+GET    /api/gis/map-config       # 获取地图配置
+```
+
+### 前端组件树
+```
+GISMap (主组件)
+├── MapControl (地图控制)
+│   ├── LayerSwitch (图层切换)
+│   ├── BaseMapSwitch (底图切换)
+│   └── ZoomControl (缩放控制)
+├── DeviceMarker (监测点位标记)
+│   ├── DevicePopup (点位弹窗)
+│   └── DeviceInfo (点位信息)
+├── PipeLayer (管网图层)
+├── Trajectory (轨迹回放)
+└── Legend (图例)
+```
+
+### 数据流图
+[前端] → [GIS Controller] → [GIS Service] → [PostGIS] → [GeoServer] → [地图服务]

src/main/java/com/wm/gis/controller/GisController.java

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+package com.wm.gis.controller;
+
+import com.wm.gis.entity.GisBaseMap;
+import com.wm.gis.entity.IotDevice;
+import com.wm.gis.service.GisService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/gis")
+public class GisController {
+    
+    @Autowired
+    private GisService gisService;
+    
+    @GetMapping("/base-layers")
+    public List<GisBaseMap> getBaseLayers() {
+        return gisService.getBaseLayers();
+    }
+    
+    @PostMapping("/base-layers")
+    public GisBaseMap createBaseLayer(@RequestBody GisBaseMap baseMap) {
+        return gisService.createBaseLayer(baseMap);
+    }
+    
+    @GetMapping("/devices")
+    public List<IotDevice> getDevices() {
+        return gisService.getDevices();
+    }
+    
+    @PostMapping("/devices")
+    public IotDevice addDevice(@RequestBody IotDevice device) {
+        return gisService.addDevice(device);
+    }
+    
+    @GetMapping("/map-config")
+    public String getMapConfig() {
+        return """
+        {
+          "center": [44.0321, 82.8973],
+          "zoom": 10,
+          "baseLayers": [
+            {
+              "name": "OpenStreetMap",
+              "url": "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
+              "type": "osm"
+            }
+          ]
+        }
+        """;
+    }
+}

src/main/java/com/wm/gis/entity/GisBaseMap.java

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+package com.wm.gis.entity;
+
+import jakarta.persistence.*;
+import org.locationtech.jts.geom.Polygon;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "gis_base_map")
+public class GisBaseMap {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    
+    @Column(nullable = false, length = 100)
+    private String name;
+    
+    @Column(nullable = false, length = 50)
+    private String type;
+    
+    @Column(nullable = false, columnDefinition = "geometry(Polygon, 4326)")
+    private Polygon geom;
+    
+    @Column(name = "created_at")
+    private LocalDateTime createdAt;
+    
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+    
+    // getters and setters
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    public String getType() { return type; }
+    public void setType(String type) { this.type = type; }
+    public Polygon getGeom() { return geom; }
+    public void setGeom(Polygon geom) { this.geom = geom; }
+    public LocalDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+    public LocalDateTime getUpdatedAt() { return updatedAt; }
+    public void setUpdatedAt(LocalDateTime updatedAt) { this.updatedAt = updatedAt; }
+}

src/main/java/com/wm/gis/entity/IotDevice.java

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+package com.wm.gis.entity;
+
+import jakarta.persistence.*;
+import org.locationtech.jts.geom.Point;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "iot_device")
+public class IotDevice {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    
+    @Column(unique = true, nullable = false, length = 50)
+    private String deviceCode;
+    
+    @Column(nullable = false, length = 100)
+    private String name;
+    
+    @Column(nullable = false, length = 50)
+    private String deviceType;
+    
+    @Column(name = "longitude", precision = 10, scale = 6)
+    private Double longitude;
+    
+    @Column(name = "latitude", precision = 10, scale = 6)
+    private Double latitude;
+    
+    @Column(name = "gis_layer_name", length = 100)
+    private String gisLayerName;
+    
+    @Column(name = "created_at")
+    private LocalDateTime createdAt;
+    
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+    
+    @Column(name = "location_geom", columnDefinition = "geometry(Point, 4326)")
+    private Point locationGeom;
+    
+    // getters and setters
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getDeviceCode() { return deviceCode; }
+    public void setDeviceCode(String deviceCode) { this.deviceCode = deviceCode; }
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    public String getDeviceType() { return deviceType; }
+    public void setDeviceType(String deviceType) { this.deviceType = deviceType; }
+    public Double getLongitude() { return longitude; }
+    public void setLongitude(Double longitude) { this.longitude = longitude; }
+    public Double getLatitude() { return latitude; }
+    public void setLatitude(Double latitude) { this.latitude = latitude; }
+    public String getGisLayerName() { return gisLayerName; }
+    public void setGisLayerName(String gisLayerName) { this.gisLayerName = gisLayerName; }
+    public LocalDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+    public LocalDateTime getUpdatedAt() { return updatedAt; }
+    public void setUpdatedAt(LocalDateTime updatedAt) { this.updatedAt = updatedAt; }
+    public Point getLocationGeom() { return locationGeom; }
+    public void setLocationGeom(Point locationGeom) { this.locationGeom = locationGeom; }
+}

src/main/java/com/wm/gis/service/GisService.java

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+package com.wm.gis.service;
+
+import com.wm.gis.entity.GisBaseMap;
+import com.wm.gis.entity.IotDevice;
+import java.util.List;
+
+public interface GisService {
+    List<GisBaseMap> getBaseLayers();
+    GisBaseMap createBaseLayer(GisBaseMap baseMap);
+    List<IotDevice> getDevices();
+    IotDevice addDevice(IotDevice device);
+}