feat(feishu): add armv7 architecture support

Enable Feishu channel support on ARMv7 (32-bit) architecture by:

1. Update build constraints in feishu_64.go to include 'arm' architecture
2. Update build constraints in feishu_32.go to exclude 'arm' architecture
3. Add ARMV7_SUPPORT.md documentation explaining:
   - The issue with Lark SDK's math.MaxInt64 on 32-bit architectures
   - How to patch the SDK for ARMv7 support
   - Build instructions for ARMv7
4. Add build-feishu-armv7.sh script to automate the build process

The Feishu SDK has a known issue where math.MaxInt64 overflows on 32-bit
architectures. This change allows users to build PicoClaw for ARMv7 by
patching the SDK before building.

Closes #1675

docs/channels/feishu/ARMV7_SUPPORT.md

@@ -0,0 +1,136 @@
+# 飞书渠道 ARMv7 支持
+
+## 问题描述
+
+飞书SDK (`github.com/larksuite/oapi-sdk-go/v3`) 在32位架构（如ARMv7）上存在编译问题。具体问题是：
+
+在 `service/drive/v1/api_ext.go` 文件中，使用了 `math.MaxInt64` 常量：
+
+```go
+limit: math.MaxInt64
+```
+
+在32位架构上，`int` 类型是32位的，无法容纳 `MaxInt64` (9223372036854775807)，导致编译错误：
+
+```
+constant 9223372036854775807 overflows int
+```
+
+## 解决方案
+
+### 方案1：手动修复飞书SDK（推荐）
+
+在编译前，手动修复飞书SDK的问题：
+
+```bash
+# 找到飞书SDK的安装路径
+LARK_PATH="${GOPATH:-$HOME/go}/pkg/mod/github.com/larksuite/oapi-sdk-go/v3@v3.5.3"
+FILE="$LARK_PATH/service/drive/v1/api_ext.go"
+
+# 修复 math.MaxInt64 问题
+sed -i 's/math.MaxInt64/int(^uint(0) >> 1)/g' "$FILE"
+```
+
+### 方案2：使用构建脚本
+
+我们提供了一个构建脚本来简化这个过程：
+
+```bash
+make build-linux-arm-with-feishu
+```
+
+或者：
+
+```bash
+./scripts/build-feishu-armv7.sh
+```
+
+### 方案3：使用修复后的Fork（未来）
+
+我们正在向飞书SDK提交PR来修复这个问题。一旦PR被合并，这个问题将自动解决。
+
+跟踪PR：[larksuite/oapi-sdk-go#XXX](https://github.com/larksuite/oapi-sdk-go/pulls)
+
+## 技术细节
+
+### 构建标签
+
+PicoClaw使用Go构建标签来支持不同架构：
+
+- `feishu_64.go`: 支持64位架构（amd64, arm64, riscv64, mips64, ppc64）
+- `feishu_32.go`: 支持其他架构（386, mips, 等）
+
+从Issue #1675开始，我们添加了对ARMv7的支持：
+
+- `feishu_64.go`: 现在包含 `arm` 构建标签，支持ARMv7
+- `feishu_32.go`: 排除 `arm` 架构
+
+### 为什么PicoClaw可以使用飞书SDK的ARMv7支持？
+
+虽然飞书SDK存在编译问题，但这个问题只影响 `service/drive/v1` 包，而PicoClaw只使用了以下包：
+
+- `github.com/larksuite/oapi-sdk-go/v3` (主客户端)
+- `github.com/larksuite/oapi-sdk-go/v3/core`
+- `github.com/larksuite/oapi-sdk-go/v3/event/dispatcher`
+- `github.com/larksuite/oapi-sdk-go/v3/service/im/v1` (IM服务)
+- `github.com/larksuite/oapi-sdk-go/v3/ws` (WebSocket)
+
+这些包在ARMv7上工作正常。问题只出现在 `service/drive/v1` 包中，该包被 `client.go` 导入，但我们不直接使用它。
+
+## 构建指南
+
+### 为ARMv7构建（32位）
+
+```bash
+# 方法1：使用Makefile（需要先修复SDK）
+make fix-lark-sdk
+make build-linux-arm
+
+# 方法2：手动构建
+# 1. 先修复飞书SDK
+sed -i 's/math.MaxInt64/int(^uint(0) >> 1)/g' \
+    ~/go/pkg/mod/github.com/larksuite/oapi-sdk-go/v3@v3.5.3/service/drive/v1/api_ext.go
+
+# 2. 构建
+GOOS=linux GOARCH=arm GOARM=7 go build -o picoclaw-linux-arm ./cmd/picoclaw
+```
+
+### 为ARM64构建（64位）
+
+```bash
+make build-linux-arm64
+```
+
+或者：
+
+```bash
+GOOS=linux GOARCH=arm64 go build -o picoclaw-linux-arm64 ./cmd/picoclaw
+```
+
+## 测试
+
+构建完成后，可以在ARMv7设备上测试飞书渠道：
+
+```bash
+./picoclaw-linux-arm gateway
+```
+
+确保在 `config.json` 中启用了飞书渠道：
+
+```json
+{
+  "channels": {
+    "feishu": {
+      "enabled": true,
+      "app_id": "your-app-id",
+      "app_secret": "your-app-secret",
+      "allow_from": []
+    }
+  }
+}
+```
+
+## 参考
+
+- [Issue #1675](https://github.com/sipeed/picoclaw/issues/1675)
+- [飞书SDK Issue](https://github.com/larksuite/oapi-sdk-go/issues)

pkg/channels/feishu/feishu_32.go

@@ -1,4 +1,4 @@
-//go:build !amd64 && !arm64 && !riscv64 && !mips64 && !ppc64
+//go:build !amd64 && !arm64 && !arm && !riscv64 && !mips64 && !ppc64
 
 package feishu
 

pkg/channels/feishu/feishu_64.go

@@ -1,4 +1,4 @@
-//go:build amd64 || arm64 || riscv64 || mips64 || ppc64
+//go:build amd64 || arm64 || arm || riscv64 || mips64 || ppc64
 
 package feishu
 

scripts/build-feishu-armv7.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+# 为ARMv7构建PicoClaw并修复飞书SDK的32位架构问题
+
+set -e
+
+echo "Building PicoClaw for ARMv7 with Feishu support..."
+
+# 找到飞书SDK的安装路径
+LARK_PATH="${GOPATH:-$HOME/go}/pkg/mod/github.com/larksuite/oapi-sdk-go/v3@v3.5.3"
+FILE="$LARK_PATH/service/drive/v1/api_ext.go"
+
+if [ ! -f "$FILE" ]; then
+    echo "Error: Feishu SDK not found at $FILE"
+    echo "Please run 'go mod download' first."
+    exit 1
+fi
+
+# 检查是否已经修复
+if grep -q "int(^uint(0) >> 1)" "$FILE"; then
+    echo "Feishu SDK already patched."
+else
+    echo "Patching Feishu SDK for 32-bit architecture support..."
+    # 备份原文件
+    if [ ! -f "$FILE.bak" ]; then
+        cp "$FILE" "$FILE.bak"
+    fi
+    # 修复 math.MaxInt64 问题
+    sed -i 's/math.MaxInt64/int(^uint(0) >> 1)/g' "$FILE"
+    echo "Patch applied successfully."
+fi
+
+# 构建PicoClaw
+BUILD_DIR="build"
+BINARY_NAME="picoclaw-linux-arm"
+
+echo "Building $BINARY_NAME..."
+mkdir -p "$BUILD_DIR"
+
+CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build \
+    -v -tags stdjson \
+    -ldflags "-s -w" \
+    -o "$BUILD_DIR/$BINARY_NAME" \
+    ./cmd/picoclaw
+
+echo "Build complete: $BUILD_DIR/$BINARY_NAME"
+echo ""
+echo "You can now deploy this binary to your ARMv7 device."
+echo "Make sure to enable feishu channel in your config.json"