fix: 中文摄像头名直接用SHA256 hash避免数字提取碰撞

internal/service/auto_config.go

@@ -606,24 +606,14 @@ func cleanSourceNames(names []string) []string {
 
 // deriveSafeInstanceName converts a user-facing video source name into a valid
 // recognition unit instance name ([A-Za-z0-9_.-]+). If the source name is already
-// valid, it's used as-is. Otherwise, a sanitised version is generated.
+// valid, it's used as-is. Otherwise, a unique hash-based name is generated.
 func deriveSafeInstanceName(srcName string) string {
     // If already valid per validateConfigName rules, use as-is.
     if safeConfigName.MatchString(srcName) {
         return srcName
     }
-    // Build a safe name from the source: keep only ASCII letters, digits, underscores.
-    var b strings.Builder
-    for _, r := range srcName {
-        if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9') || r == '_' || r == '-' || r == '.' {
-            b.WriteRune(r)
-        }
-    }
-    derived := strings.Trim(b.String(), "-_.")
-    if derived != "" && safeConfigName.MatchString(derived) {
-        return derived
-    }
-    // Fallback: use a short hash suffix to guarantee uniqueness.
+    // For non-ASCII names, use a hash prefix to guarantee uniqueness
+    // (extracting digits/ASCII from Chinese names causes collisions e.g. "5跨主通道" and "5跨焙烧区" both → "5").
     sum := sha256.Sum256([]byte(srcName))
     return "src_" + strings.ToLower(hex.EncodeToString(sum[:4]))
 }