feat(integrations): add persistent connection API

[erichare]

Summary

• persist user- and instance-owned connection metadata separately from Fernet-encrypted credential envelopes
• add owner- and share-aware connection lifecycle routes with scope and non-interactive execution enforcement
• publish connection requirements in deployment artifacts, extend authorization coverage, and document the API and storage model

Validation

• 66 passed, 1 skipped across the connection API, deployment artifacts, secret scrubbing, authorization matrix, and migration coverage; the PostgreSQL migration case is skipped without a configured local database
• focused mypy: 8 source files passed
• ruff and all pre-commit hooks passed

Stack

• depends on feat(integrations): load bundle capability manifests #14920

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[github-actions]

✅ Migration Validation Passed

All migrations follow the Expand-Contract pattern correctly.

[github-actions]

✅ Test Coverage Advisor

No source changes detected without accompanying tests. Thanks for keeping coverage up! 🎉

Advisory check only — never blocks merge.

[github-actions]

Build successful! ✅
Deploying docs draft.
Deploy successful! View draft

[codecov]

Codecov Report

❌ Patch coverage is 73.47741% with 135 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.84%. Comparing base (70f7e0c) to head (2e3225b).

Files with missing lines	Patch %	Lines
...ckend/base/langflow/services/connection/service.py	55.80%	99 Missing ⚠️
src/backend/base/langflow/api/v1/connections.py	74.54%	14 Missing ⚠️
.../langflow/services/deployment_artifacts/builder.py	82.08%	12 Missing ⚠️
...low/services/database/models/connection/schemas.py	90.80%	8 Missing ⚠️
...ckend/base/langflow/services/connection/factory.py	90.90%	1 Missing ⚠️
src/backend/base/langflow/utils/flow_secrets.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                          @@
##           fix/int-3-extension-integrations   #14921      +/-   ##
====================================================================
- Coverage                             66.50%   65.84%   -0.67%     
====================================================================
  Files                                  2516     2523       +7     
  Lines                                262413   263021     +608     
  Branches                              36879    36940      +61     
====================================================================
- Hits                                 174516   173174    -1342     
- Misses                                85673    87623    +1950     
  Partials                               2224     2224              

Flag	Coverage Δ
backend	73.44% <73.42%> (-0.54%)	⬇️
frontend	63.63% <ø> (-0.93%)	⬇️
lfx	65.11% <100.00%> (+<0.01%)	⬆️

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/api/router.py	100.00% <100.00%> (ø)
src/backend/base/langflow/api/v1/authz_shares.py	91.60% <100.00%> (+0.09%)	⬆️
...ckend/base/langflow/api/v1/schemas/authz_shares.py	100.00% <ø> (ø)
...nd/base/langflow/services/authorization/actions.py	100.00% <100.00%> (ø)
...end/base/langflow/services/authorization/guards.py	95.81% <100.00%> (+1.10%)	⬆️
...ase/langflow/services/authorization/permissions.py	100.00% <ø> (ø)
...gflow/services/database/models/connection/model.py	100.00% <100.00%> (ø)
src/backend/base/langflow/services/deps.py	94.69% <100.00%> (-3.48%)	⬇️
src/backend/base/langflow/services/factory.py	85.50% <100.00%> (ø)
src/backend/base/langflow/services/utils.py	87.40% <100.00%> (-0.63%)	⬇️
... and 7 more

... and 304 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	55.65% (84754/152292)	72.46% (12551/17319)	50.95% (2000/3925)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
6641	0 💤	0 ❌	0 🔥	25m 3s ⏱️