Related Issues

Fixes:

• Build fails on 32-bit ARM (linux/armv7): math.MaxInt64 overflows int #15
• Armv7 version #91

As requested in #91 (comment) by @mengzhuo, this PR addresses the build failure on 32-bit architectures.

Problem:

../go/pkg/mod/github.com/larksuite/oapi-sdk-go/v3@v3.5.3/service/drive/v1/api_ext.go:30:13: cannot use math.MaxInt64 (untyped int constant 9223372036854775807) as int value in struct literal (overflows)
make: *** [Makefile:68: build] Error 1

pkg/channels/feishu.go depends on github.com/larksuite/oapi-sdk-go, which does not support 32-bit architectures due to usage of math.MaxInt64 where int overflows on 32-bit systems.
As a result, builds fail on 32-bit platforms (e.g., armv7l).

Solution:
Introduce architecture-specific files:

• feishu_64.go – enabled on 64-bit platforms
• feishu_32.go – excludes Feishu support on 32-bit platforms

This uses Go build constraints to skip Feishu on unsupported 32-bit architectures, allowing the project to compile successfully.

Testing:
✅ Built successfully on ARMv7 (32-bit) using a Tinker Board S
✅ Ran make build-all on a 64-bit system
✅ No build or installation errors observed