feat: device capabilities from agent /v1/capabilities

Agent 新增 /v1/capabilities 接口，返回设备检测能力列表。
Managerd 控制台查询此接口，仅显示设备真实支持的功能。

- Agent: capabilities.go — 根据插件节点类型映射能力
- Managerd: pageConsole 查询 /v1/capabilities 过滤可选功能
- ConsoleFeature 增加 Description 字段，hover 显示说明
- 旧 agent 无此接口时回退为显示已持久化的功能

internal/service/auto_config.go

@@ -19,6 +19,9 @@ type FeatureDef struct {
 // FeatureRegistry centralises which templates cover which detection features.
 type FeatureRegistry struct {
     features map[string]*FeatureDef
+    // nodeTypeRequirements maps feature key → required media-server node types.
+    // If a device lacks any required node type, the feature is unavailable.
+    nodeTypeRequirements map[string][]string
 }
 
 // NewFeatureRegistry creates a registry with the built-in feature definitions.
@@ -50,7 +53,16 @@ func NewFeatureRegistry() *FeatureRegistry {
             Templates: []string{}, // 模板就绪后再补充
         },
     }
-    r := &FeatureRegistry{features: make(map[string]*FeatureDef, len(defs))}
+    r := &FeatureRegistry{
+        features:             make(map[string]*FeatureDef, len(defs)),
+        nodeTypeRequirements: map[string][]string{
+            "face":      {"ai_face_recog"},                                     // face recognition plugin
+            "shoe":      {"ai_shoe_det"},                                        // shoe detection plugin
+            "helmet":    {"ai_yolo"},                                             // YOLO for helmet (model pending)
+            "smoking":   {"action_recog"},                                        // action recognition for smoking
+            "intrusion": {"region_event"},                                        // region-based intrusion
+        },
+    }
     for i := range defs {
         r.features[defs[i].Key] = &defs[i]
     }
@@ -68,6 +80,41 @@ func (r *FeatureRegistry) FeatureKeys() []string {
 }
 
 // Feature returns the definition for a feature key, or nil.
+// AvailableFeatures returns the subset of registered features that are supported
+// by the given device node types (from /v1/graph-node-types).
+// If nodeTypes is nil/empty, all features are considered available (fallback for
+// old agents that don't expose node types).
+func (r *FeatureRegistry) AvailableFeatures(nodeTypes []string) []FeatureDef {
+    all := r.AllFeatures()
+    if len(nodeTypes) == 0 {
+        return all // no info → assume all available
+    }
+    typeSet := make(map[string]bool, len(nodeTypes))
+    for _, t := range nodeTypes {
+        typeSet[t] = true
+    }
+    out := make([]FeatureDef, 0, len(all))
+    for _, f := range all {
+        if r.featureAvailable(f.Key, typeSet) {
+            out = append(out, f)
+        }
+    }
+    return out
+}
+
+func (r *FeatureRegistry) featureAvailable(key string, nodeTypes map[string]bool) bool {
+    required, ok := r.nodeTypeRequirements[key]
+    if !ok || len(required) == 0 {
+        return true // no specific plugin requirement → always available
+    }
+    for _, t := range required {
+        if !nodeTypes[t] {
+            return false
+        }
+    }
+    return true
+}
+
 func (r *FeatureRegistry) Feature(key string) *FeatureDef {
     return r.features[key]
 }

internal/web/ui.go

@@ -909,13 +909,36 @@ func (u *UI) pageConsole(w http.ResponseWriter, r *http.Request) {
         sourceNames[s.Name] = s.Name
     }
 
-    // Feature definitions
-    featureDefs := []ConsoleFeature{
-        {Key: "face", Label: "人脸识别"},
-        {Key: "shoe", Label: "劳保鞋检测"},
-        {Key: "helmet", Label: "安全帽检测"},
-        {Key: "smoking", Label: "抽烟检测"},
-        {Key: "intrusion", Label: "区域入侵"},
+    // Query each device's capabilities from agent to filter available features.
+    deviceAvailableFeatures := map[string][]ConsoleFeature{}
+    if u.agent != nil {
+        for _, dev := range devices {
+            if dev == nil || !dev.Online || dev.DeviceID == "" {
+                continue
+            }
+            body, code, err := u.agent.Do("GET", dev.IP, dev.AgentPort, "/v1/capabilities", nil)
+            if err != nil || code != 200 {
+                continue
+            }
+            var capsResp struct {
+                Capabilities []struct {
+                    Key         string `json:"key"`
+                    Label       string `json:"label"`
+                    Available   bool   `json:"available"`
+                    Description string `json:"description"`
+                } `json:"capabilities"`
+            }
+            if json.Unmarshal(body, &capsResp) != nil {
+                continue
+            }
+            features := make([]ConsoleFeature, 0, len(capsResp.Capabilities))
+            for _, c := range capsResp.Capabilities {
+                if c.Available {
+                    features = append(features, ConsoleFeature{Key: c.Key, Label: c.Label, Description: c.Description, Enabled: false})
+                }
+            }
+            deviceAvailableFeatures[dev.DeviceID] = features
+        }
     }
 
     // Load persisted device features as the source of truth.
@@ -1015,10 +1038,20 @@ func (u *UI) pageConsole(w http.ResponseWriter, r *http.Request) {
             activeKeys = map[string]bool{}
         }
 
+        // Features from device capabilities (filtered by agent /v1/capabilities).
+        // Fall back to persisted keys if agent doesn't respond.
+        available := deviceAvailableFeatures[dev.DeviceID]
         var features []ConsoleFeature
-        for _, fd := range featureDefs {
-            f := ConsoleFeature{Key: fd.Key, Label: fd.Label, Enabled: activeKeys[fd.Key]}
-            features = append(features, f)
+        if len(available) > 0 {
+            for _, f := range available {
+                f.Enabled = activeKeys[f.Key]
+                features = append(features, f)
+            }
+        } else {
+            // Old agent: use persisted keys to show at least what's configured.
+            for key := range activeKeys {
+                features = append(features, ConsoleFeature{Key: key, Label: key, Enabled: true})
+            }
         }
 
         npu, diskUsage, temp, cpuUsage, memUsage := 0.0, 0.0, 0.0, 0.0, 0.0
@@ -4695,7 +4728,8 @@ type ConsoleChannel struct {
 }
 
 type ConsoleFeature struct {
-    Key     string
-    Label   string
-    Enabled bool
+    Key         string
+    Label       string
+    Description string
+    Enabled     bool
 }

internal/web/ui/templates/console.html

@@ -62,7 +62,7 @@
           {{range $f := $cd.Features}}
           <tr>
             <td class="console-feature-check"><input type="checkbox" name="device_{{$cd.Device.DeviceID}}_feature" value="{{$f.Key}}"{{if $f.Enabled}} checked{{end}}></td>
-            <td class="console-feature-label">{{$f.Label}}</td>
+            <td class="console-feature-label" title="{{$f.Description}}">{{$f.Label}}</td>
           </tr>
           {{end}}
         </table>