feat: introduce API leveling, post_training, eval to v1alpha (#3449)

# What does this PR do?

Rather than have a single `LLAMA_STACK_VERSION`, we need to have a
`_V1`, `_V1ALPHA`, and `_V1BETA` constant.

This also necessitated addition of `level` to the `WebMethod` so that
routing can be handeled properly.


For backwards compat, the `v1` routes are being kept around and marked
as `deprecated`. When used, the server will log a deprecation warning.

Deprecation log:

<img width="1224" height="134" alt="Screenshot 2025-09-25 at 2 43 36 PM"
src="https://github.com/user-attachments/assets/0cc7c245-dafc-48f0-be99-269fb9a686f9"
/>

move:
1. post_training to `v1alpha` as it is under heavy development and not
near its final state
2. eval: job scheduling is not implemented. Relies heavily on the
datasetio API which is under development missing implementations of
specific routes indicating the structure of those routes might change.
Additionally eval depends on the `inference` API which is going to be
deprecated, eval will likely need a major API surface change to conform
to using completions properly

implements leveling in #3317 

note: integration tests will fail until the SDK is regenerated with
v1alpha/inference as opposed to v1/inference

## Test Plan

existing tests should pass with newly generated schema. Conformance will
also pass as these routes are not the ones we currently test for
stability

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

llama_stack/apis/vector_dbs/vector_dbs.py

@@ -9,6 +9,7 @@ from typing import Literal, Protocol, runtime_checkable
 from pydantic import BaseModel
 
 from llama_stack.apis.resource import Resource, ResourceType
+from llama_stack.apis.version import LLAMA_STACK_API_V1
 from llama_stack.providers.utils.telemetry.trace_protocol import trace_protocol
 from llama_stack.schema_utils import json_schema_type, webmethod
 
@@ -65,7 +66,7 @@ class ListVectorDBsResponse(BaseModel):
 @runtime_checkable
 @trace_protocol
 class VectorDBs(Protocol):
-    @webmethod(route="/vector-dbs", method="GET")
+    @webmethod(route="/vector-dbs", method="GET", level=LLAMA_STACK_API_V1)
     async def list_vector_dbs(self) -> ListVectorDBsResponse:
         """List all vector databases.
 
@@ -73,7 +74,7 @@ class VectorDBs(Protocol):
         """
         ...
 
-    @webmethod(route="/vector-dbs/{vector_db_id:path}", method="GET")
+    @webmethod(route="/vector-dbs/{vector_db_id:path}", method="GET", level=LLAMA_STACK_API_V1)
     async def get_vector_db(
         self,
         vector_db_id: str,
@@ -85,7 +86,7 @@ class VectorDBs(Protocol):
         """
         ...
 
-    @webmethod(route="/vector-dbs", method="POST")
+    @webmethod(route="/vector-dbs", method="POST", level=LLAMA_STACK_API_V1)
     async def register_vector_db(
         self,
         vector_db_id: str,
@@ -107,7 +108,7 @@ class VectorDBs(Protocol):
         """
         ...
 
-    @webmethod(route="/vector-dbs/{vector_db_id:path}", method="DELETE")
+    @webmethod(route="/vector-dbs/{vector_db_id:path}", method="DELETE", level=LLAMA_STACK_API_V1)
     async def unregister_vector_db(self, vector_db_id: str) -> None:
         """Unregister a vector database.