fix(launch): add --no-build-isolation to open_clip and requirements installs

Commit 76759a1 added --no-build-isolation to the clip install to fix
BackendUnavailable errors with pip 26+ on embedded/portable Python
environments, but the same flag was missing from open_clip and the
requirements installs.

open_clip (GitHub ZIP) and jsonmerge (in requirements_versions.txt) are
source distributions that pip must build. With pip 26+, the isolated
build environment fails to import setuptools.build_meta, causing:

  BackendUnavailable: Cannot import 'setuptools.build_meta'

Adding --no-build-isolation to these calls mirrors the existing fix
for clip and allows pip to use the already-installed setuptools
(69.5.1, pinned in requirements_versions.txt) directly.

Fixes startup failures on portable/embedded Python 3.10.6 installs
(e.g. sd.webui one-click package) with pip 26+.

Related: #17201 #17284 #17287

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: lfl1337

modules/launch_utils.py

@@ -443,7 +443,7 @@ def ensure_build_dependencies():
         startup_timer.record("install clip")
 
     if not is_installed("open_clip"):
-        run_pip(f"install {openclip_package}", "open_clip")
+        run_pip(f"install --no-build-isolation {openclip_package}", "open_clip")
         startup_timer.record("install open_clip")
 
     if (not is_installed("xformers") or args.reinstall_xformers) and args.xformers:
@@ -468,14 +468,14 @@ def ensure_build_dependencies():
         requirements_file = os.path.join(script_path, requirements_file)
 
     if not requirements_met(requirements_file):
-        run_pip(f"install -r \"{requirements_file}\"", "requirements")
+        run_pip(f"install --no-build-isolation -r \"{requirements_file}\"", "requirements")
         startup_timer.record("install requirements")
 
     if not os.path.isfile(requirements_file_for_npu):
         requirements_file_for_npu = os.path.join(script_path, requirements_file_for_npu)
 
     if "torch_npu" in torch_command and not requirements_met(requirements_file_for_npu):
-        run_pip(f"install -r \"{requirements_file_for_npu}\"", "requirements_for_npu")
+        run_pip(f"install --no-build-isolation -r \"{requirements_file_for_npu}\"", "requirements_for_npu")
         startup_timer.record("install requirements_for_npu")
 
     if not args.skip_install: