feat: split API and provider specs into separate llama-stack-api pkg

Extract API definitions, models, and provider specifications into a
standalone llama-stack-api package that can be published to PyPI
independently of the main llama-stack server.

Motivation

External providers currently import from llama-stack, which overrides
the installed version and causes dependency conflicts. This separation
allows external providers to:

- Install only the type definitions they need without server dependencies
- Avoid version conflicts with the installed llama-stack package
- Be versioned and released independently

This enables us to re-enable external provider module tests that were
previously blocked by these import conflicts.

Changes

- Created llama-stack-api package with minimal dependencies (pydantic, jsonschema)
- Moved APIs, providers datatypes, strong_typing, and schema_utils
- Updated all imports from llama_stack.* to llama_stack_api.*
- Preserved git history using git mv for moved files
- Configured local editable install for development workflow
- Updated linting and type-checking configuration for both packages
- Rebased on top of upstream src/ layout changes

Testing

Package builds successfully and can be imported independently.
All pre-commit hooks pass with expected exclusions maintained.

Next Steps

- Publish llama-stack-api to PyPI
- Update external provider dependencies
- Re-enable external provider module tests

Signed-off-by: Charlie Doern <cdoern@redhat.com>

src/llama_stack/core/inspect.py

@@ -6,19 +6,19 @@
 
 from importlib.metadata import version
 
-from pydantic import BaseModel
-
-from llama_stack.apis.inspect import (
+from llama_stack_api.apis.inspect import (
     HealthInfo,
     Inspect,
     ListRoutesResponse,
     RouteInfo,
     VersionInfo,
 )
+from llama_stack_api.providers.datatypes import HealthStatus
+from pydantic import BaseModel
+
 from llama_stack.core.datatypes import StackRunConfig
 from llama_stack.core.external import load_external_apis
 from llama_stack.core.server.routes import get_all_api_routes
-from llama_stack.providers.datatypes import HealthStatus
 
 
 class DistributionInspectConfig(BaseModel):