fix: handle missing clipboard in headless environments for langflow api-key command

[andifilhohub]

Summary

• langflow api-key crashed with PyperclipException in headless environments (Docker, SSH) because pyperclip.copy() was called without error handling, before any output was shown
• The crash occurred after the key was generated and the previous one deleted from the database — making the new key unrecoverable, since it only exists in plain text at creation time
• The fix wraps pyperclip.copy() in a try/except: the API key is always displayed in the terminal regardless of clipboard availability

Changes

• api_key_banner: wraps pyperclip.copy() in try/except; adapts banner text based on whether clipboard is available or not
• Added 5 unit tests covering: clipboard available, headless without clipboard, UnicodeEncodeError fallback with and without clipboard

Test plan

• python -m pytest src/backend/tests/unit/test_cli.py::TestApiKeyBanner -v
• Manually validate in a Docker container: langflow api-key should display the key without raising an exception

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.26%. Comparing base (41d34b2) to head (64d8863).

Files with missing lines	Patch %	Lines
src/backend/base/langflow/__main__.py	0.00%	10 Missing ⚠️

❌ Your project check has failed because the head coverage (44.71%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.9.0   #12351      +/-   ##
=================================================
- Coverage          48.23%   46.26%   -1.97%     
=================================================
  Files               1848     1847       -1     
  Lines             160885   161555     +670     
  Branches           23643    23721      +78     
=================================================
- Hits               77607    74751    -2856     
- Misses             82394    85920    +3526     
  Partials             884      884              

Flag	Coverage Δ
backend	43.08% <0.00%> (-11.80%)	⬇️
frontend	47.29% <ø> (-0.30%)	⬇️
lfx	44.71% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/backend/base/langflow/__main__.py	19.71% <0.00%> (-35.59%)	⬇️

... and 337 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	26.68% (27018/101229)	63.32% (3345/5282)	28.82% (639/2217)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
2784	0 💤	0 ❌	0 🔥	4m 1s ⏱️