feat(app-instance): 集成Beaver后端并更新配置管理

集成新的Beaver后端服务到应用实例中，替换原有的nanobot实现。

主要变更包括：
- 在Dockerfile和环境配置中添加Beaver相关路径和配置变量
- 更新工作目录结构从.nanobot到.beaver
- 实现Beaver引擎加载器，支持配置文件加载和工具组装
- 添加内置工具如ListDirectoryTool、ReadFileTool、SearchFilesTool
- 更新消息处理流程，支持通道适配器和网关模式
- 重构技能系统，支持显式工具提示和嵌入式检索
- 改进错误处理和生命周期管理

此变更使应用实例能够使用统一的Beaver后端进行AI代理运行时管理。

app-instance/entrypoint.sh

@@ -4,9 +4,12 @@ set -euo pipefail
 APP_PUBLIC_PORT="${APP_PUBLIC_PORT:-8080}"
 APP_FRONTEND_PORT="${APP_FRONTEND_PORT:-3000}"
 APP_BACKEND_PORT="${APP_BACKEND_PORT:-18080}"
-NANOBOT_HOME="${NANOBOT_HOME:-/root/.nanobot}"
-NANOBOT_AUTH_FILE="${NANOBOT_AUTH_FILE:-$NANOBOT_HOME/web_auth_users.json}"
-NANOBOT_RUNTIME_ENV_FILE="${NANOBOT_RUNTIME_ENV_FILE:-$NANOBOT_HOME/runtime.env}"
+BEAVER_HOME="${BEAVER_HOME:-/root/.beaver}"
+BEAVER_CONFIG_PATH="${BEAVER_CONFIG_PATH:-$BEAVER_HOME/config.json}"
+BEAVER_WORKSPACE="${BEAVER_WORKSPACE:-$BEAVER_HOME/workspace}"
+NANOBOT_HOME="${NANOBOT_HOME:-$BEAVER_HOME}"
+NANOBOT_AUTH_FILE="${NANOBOT_AUTH_FILE:-$BEAVER_HOME/web_auth_users.json}"
+NANOBOT_RUNTIME_ENV_FILE="${NANOBOT_RUNTIME_ENV_FILE:-$BEAVER_HOME/runtime.env}"
 
 log() {
   printf '[app-instance] %s\n' "$*"
@@ -21,40 +24,6 @@ require_file() {
   fi
 }
 
-render_swarms_env_file() {
-  local config_path="$1"
-  local target_path="$2"
-
-  CONFIG_PATH="$config_path" TARGET_PATH="$target_path" python3 - <<'PY'
-import json
-import os
-from pathlib import Path
-
-config_path = Path(os.environ["CONFIG_PATH"])
-target_path = Path(os.environ["TARGET_PATH"])
-
-data = json.loads(config_path.read_text(encoding="utf-8"))
-model = str(data.get("agents", {}).get("defaults", {}).get("model") or "").strip()
-if model and "/" not in model:
-    model = f"openai/{model}"
-provider_cfg = data.get("providers", {}).get("openai", {}) or {}
-api_key = str(provider_cfg.get("apiKey") or "").strip()
-api_base = str(provider_cfg.get("apiBase") or "").strip()
-
-lines = [
-    '# Generated from /root/.nanobot/config.json for vendored swarms runtime.',
-    'WORKSPACE_DIR="/root/.nanobot/workspace"',
-    'SWARMS_VERBOSE_GLOBAL="False"',
-    'SWARMS_TELEMETRY_ON="false"',
-    f'SWARMS_DEFAULT_MODEL="{model}"',
-    f'OPENAI_API_KEY="{api_key}"',
-    f'OPENAI_API_BASE="{api_base}"',
-    f'OPENAI_BASE_URL="{api_base}"',
-]
-target_path.write_text("\n".join(lines) + "\n", encoding="utf-8")
-PY
-}
-
 cleanup() {
   local status=$?
 
@@ -74,7 +43,7 @@ cleanup() {
 
 trap cleanup EXIT INT TERM
 
-mkdir -p "$NANOBOT_HOME" "$NANOBOT_HOME/workspace"
+mkdir -p "$BEAVER_HOME" "$BEAVER_WORKSPACE"
 
 if [[ -f "$NANOBOT_RUNTIME_ENV_FILE" ]]; then
   set -a
@@ -82,24 +51,21 @@ if [[ -f "$NANOBOT_RUNTIME_ENV_FILE" ]]; then
   set +a
 fi
 
-require_file "$NANOBOT_HOME/config.json" "Missing Boardware Genius config"
-require_file "$NANOBOT_AUTH_FILE" "Missing web auth users file"
-
-SWARMS_ENV_FILE="/opt/app/backend/third_party/swarms/.env"
-render_swarms_env_file "$NANOBOT_HOME/config.json" "$SWARMS_ENV_FILE"
-if [[ -f "$SWARMS_ENV_FILE" ]]; then
-  set -a
-  . "$SWARMS_ENV_FILE"
-  set +a
-fi
+require_file "$BEAVER_CONFIG_PATH" "Missing Beaver config"
 
 export NANOBOT_AUTH_FILE
 export NANOBOT_RUNTIME_ENV_FILE
+export BEAVER_HOME
+export BEAVER_CONFIG_PATH
+export BEAVER_WORKSPACE
 export PORT="$APP_FRONTEND_PORT"
 export HOSTNAME="127.0.0.1"
 
-log "starting backend on 127.0.0.1:${APP_BACKEND_PORT}"
-nanobot web --host 127.0.0.1 --port "$APP_BACKEND_PORT" &
+log "starting Beaver backend on 127.0.0.1:${APP_BACKEND_PORT}"
+(
+  cd /opt/app/backend
+  python -m uvicorn "beaver.interfaces.web.app:create_app" --factory --host 127.0.0.1 --port "$APP_BACKEND_PORT"
+) &
 BACKEND_PID=$!
 
 log "starting frontend on 127.0.0.1:${APP_FRONTEND_PORT}"