fix: delete agent 500 error + dynamic personality + deployment guide

- Fix delete agent 500: clean up FK records (agent_llm_logs, permissions,
  schedules, executions, team_members) and unbind goals/tasks before delete
- Remove hardcoded personality templates in Android, replace with dynamic
  system prompt generation from name + description
- Set promptSectionsEnabled=false to bypass PromptComposer for personality
- Add Tencent Cloud Linux deployment guide (Docker Compose)
- Accumulated backend service updates, frontend UI fixes, Android app changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/scripts/count_extensions.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+# count_extensions.sh - 统计当前目录下每种文件扩展名的数量
+# 用法: ./count_extensions.sh [目录路径] [-r|--recursive]
+
+set -euo pipefail
+
+# 默认值
+TARGET_DIR="."
+RECURSIVE=false
+
+# 解析参数
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -r|--recursive)
+            RECURSIVE=true
+            shift
+            ;;
+        -h|--help)
+            echo "用法: $0 [目录路径] [-r|--recursive]"
+            echo ""
+            echo "选项:"
+            echo "  目录路径        要统计的目录（默认当前目录）"
+            echo "  -r, --recursive  递归统计子目录"
+            echo "  -h, --help       显示帮助信息"
+            exit 0
+            ;;
+        -*)
+            echo "错误: 未知选项 $1" >&2
+            exit 1
+            ;;
+        *)
+            TARGET_DIR="$1"
+            shift
+            ;;
+    esac
+done
+
+if [ ! -d "$TARGET_DIR" ]; then
+    echo "错误: 目录 '$TARGET_DIR' 不存在" >&2
+    exit 1
+fi
+
+echo "正在统计: $TARGET_DIR"
+echo "-------------------------"
+
+# 统计文件扩展名
+if [ "$RECURSIVE" = true ]; then
+    # 递归方式 - 包含子目录
+    result=$(find "$TARGET_DIR" -type f | awk -F. '
+        NF > 1 {
+            ext = tolower($NF)
+            count[ext]++
+        }
+        NF == 1 {
+            count["(无扩展名)"]++
+        }
+        END {
+            for (ext in count) {
+                printf "%-20s %d\n", ext, count[ext]
+            }
+        }
+    ')
+else
+    # 仅当前目录 - 不进入子目录（使用 -maxdepth 1 兼容性更好的写法）
+    result=$(find "$TARGET_DIR" -maxdepth 1 -type f | awk -F. '
+        NF > 1 {
+            ext = tolower($NF)
+            count[ext]++
+        }
+        NF == 1 {
+            count["(无扩展名)"]++
+        }
+        END {
+            for (ext in count) {
+                printf "%-20s %d\n", ext, count[ext]
+            }
+        }
+    ')
+fi
+
+# 输出结果
+if [ -z "$result" ]; then
+    echo "（没有找到文件）"
+    exit 0
+fi
+
+echo "$result" | sort -k2 -nr | awk '
+    BEGIN { total = 0 }
+    { 
+        printf "  %-20s %s\n", $1, $2
+        total += $2
+    }
+    END {
+        print "-------------------------"
+        printf "  合计: %d 个文件\n", total
+    }
+'