feat: package langflow service implementations

[HzaRashid]

Extracts Langflow's service implementations into a standalone langflow-services distribution using the langflow_services.* namespace.

langflow-base will now depend on langflow-services which depends on lfx.

This PR is stacked on #14001, which moves canonical ORM models into LFX.

Changes

• Added the langflow-services workspace package and packaging metadata.
• Moved concrete service implementations, factories, provider backends, and deployment adapters into langflow_services.*.
• Kept service contracts, ServiceType, ServiceManager, registries, and canonical ORM models in LFX.
• Converted existing langflow.services.* modules into one-way compatibility shims so public imports and monkeypatch targets retain object identity.
• Added explicit host-injected hooks for CRUD, Alembic paths, auth defaults, audit cleanup, and knowledge-base helpers.
• Registered concrete factories through the lfx.service-packages entry point while preserving lazy initialization for jobs, flow events, and MemoryBase.
• Split optional dependencies into service and backend extras, including PostgreSQL, Redis, S3, Celery, Kubernetes, tracing providers, and Watsonx Orchestrate.
• Updated workspace, Docker, CI, nightly, release, and versioning workflows to build and publish the new package.

Package boundaries

• lfx: service contracts, lifecycle, registries, settings, and ORM models.
• langflow-services: concrete implementations and implementation-owned helpers.
• langflow-base: FastAPI host lifecycle, CRUD, Alembic, API helpers, and compatibility shims.

The standalone package is prohibited from statically or dynamically importing langflow.*.

Compatibility

Existing langflow.services.* imports remain supported through thin re-export modules. Leaf shims alias the implementation modules directly, preserving class identity and existing monkeypatch paths.

Database CRUD, model shims, migrations, and application startup remain in langflow-base.

Validation

Added coverage for:

• standalone package boundaries and namespace layout
• LFX contract conformance
• compatibility-shim identity
• factory registration and host hooks
• eager and lazy service initialization
• service extraction parity
• optional dependency and extras coverage
• isolated wheel installation without langflow-base
• recursive langflow_services.* imports with no langflow leakage

The isolated-wheel CI gate builds langflow-sdk, lfx, and langflow-services, installs them into a clean environment, and recursively imports the standalone package.

Reviewer notes

Most of the diff is the mechanical relocation of implementations and replacement of the original modules with compatibility shims. The primary review areas are package ownership, dependency direction, host-injected seams, optional dependency mapping, and release wiring.

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✅ Migration Validation Passed

All migrations follow the Expand-Contract pattern correctly.