Fix/sglang kt detection (#1875)

* [feat]: simplify sglang installation with submodule, auto-sync CI, and version alignment

- Add kvcache-ai/sglang as git submodule at third_party/sglang (branch = main)
- Add top-level install.sh for one-click source installation (sglang + kt-kernel)
- Add sglang-kt as hard dependency in kt-kernel/pyproject.toml
- Add CI workflow to auto-sync sglang submodule daily and create PR
- Add CI workflow to build and publish sglang-kt to PyPI
- Integrate sglang-kt build into release-pypi.yml (version.py bump publishes both packages)
- Align sglang-kt version with ktransformers via SGLANG_KT_VERSION env var injection
- Update Dockerfile to use submodule and inject aligned version
- Update all 13 doc files, CLI hints, and i18n strings to reference new install methods

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

* [build]: bump version to 0.5.2

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

* [build]: rename PyPI package from kt-kernel to ktransformers

Users can now `pip install ktransformers` to get everything
(sglang-kt is auto-installed as a dependency).

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

* Revert "[build]: rename PyPI package from kt-kernel to ktransformers"

This reverts commit e0cbbf6364.

* [build]: add ktransformers meta-package for PyPI

`pip install ktransformers` now works as a single install command.
It pulls kt-kernel (which in turn pulls sglang-kt).

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

* [fix]: show sglang-kt package version in kt version command

- Prioritize sglang-kt package version (aligned with ktransformers)
  over sglang internal __version__
- Update display name from "sglang" to "sglang-kt"

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

* [fix]: improve sglang-kt detection in kt doctor and kt version

Recognize sglang-kt package name as proof of kvcache-ai fork installation.
Previously both commands fell through to "PyPI (not recommended)" for
non-editable local source installs. Now version.py reuses the centralized
check_sglang_installation() logic.

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

* [build]: bump version to 0.5.2.post1

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

kt-kernel/python/cli/commands/doctor.py

@@ -369,7 +369,19 @@ def doctor(
     sglang_info = check_sglang_installation()
 
     if sglang_info["installed"]:
-        if sglang_info["from_source"]:
+        if sglang_info.get("is_kvcache_fork"):
+            # Package name is sglang-kt — this is definitively the kvcache-ai fork
+            if sglang_info["from_source"] and sglang_info["git_info"]:
+                git_remote = sglang_info["git_info"].get("remote", "unknown")
+                git_branch = sglang_info["git_info"].get("branch", "unknown")
+                sglang_source_value = f"sglang-kt (Source: {git_remote}, branch: {git_branch})"
+            elif sglang_info["editable"]:
+                sglang_source_value = "sglang-kt (editable)"
+            else:
+                sglang_source_value = "sglang-kt"
+            sglang_source_status = "ok"
+            sglang_source_hint = None
+        elif sglang_info["from_source"]:
             if sglang_info["git_info"]:
                 git_remote = sglang_info["git_info"].get("remote", "unknown")
                 git_branch = sglang_info["git_info"].get("branch", "unknown")
@@ -381,7 +393,7 @@ def doctor(
                 sglang_source_status = "ok"
                 sglang_source_hint = None
         else:
-            sglang_source_value = "PyPI (not recommended)"
+            sglang_source_value = "PyPI sglang (not kvcache-ai fork)"
             sglang_source_status = "warning"
             sglang_source_hint = t("sglang_pypi_hint")
     else:
@@ -411,7 +423,7 @@ def doctor(
         else:
             kt_kernel_value = t("sglang_kt_kernel_not_supported")
             kt_kernel_status = "error"
-            kt_kernel_hint = 'Reinstall SGLang from: git clone https://github.com/kvcache-ai/sglang && cd sglang && pip install -e "python[all]"'
+            kt_kernel_hint = "Reinstall SGLang: pip uninstall sglang -y && pip install sglang-kt (or run ./install.sh from ktransformers root)"
             issues_found = True
 
         checks.append(