refactor(tests): 调整测试目录结构与源码对齐

- tests/bus/ → tests/agent/ (bus_test, channel_test 合并到 agent)
- tests/qrcode/ → tests/tui/qrcode/ (qrcode 源码在 src/tui/qrcode/)
- tests/core/net/tls/crypto/ → tests/core/crypto/ (crypto 源码在 src/core/crypto/)
- 新增 tests/core/net/tls/tls13/ (对应 src/core/net/tls/tls13/)
- 新增 tests/core/log/ (对应 src/core/log/)
- 新增 tests/llm/ (对应 src/llm/)

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: killf

tests/bus/bus_test.rs tests/agent/bus_test.rstests/bus/bus_test.rs renamed to tests/agent/bus_test.rs

@@ -1,3 +1,5 @@
+mod bus_test;
+mod channel_test;
 mod llm_stream_test;
 mod message_test;
 mod prompt_test;

tests/bus/channel_test.rs tests/agent/channel_test.rstests/bus/channel_test.rs renamed to tests/agent/channel_test.rs

@@ -1 +1,5 @@
-mod md5_test;
+// Crypto test module root
+
+pub mod aes_gcm_test;
+pub mod sha256_test;
+pub mod x25519_test;

tests/agent/mod.rs

@@ -0,0 +1 @@
+// Core log tests

tests/bus/mod.rs

@@ -3,6 +3,7 @@ mod bigint_test;
 mod crypto;
 mod encoding;
 mod jsonrpc_test;
+mod log;
 mod net;
 mod runtime;
 mod sync_test;