refactor: inspect routes now shows all non-deprecated APIs (#4116)

# What does this PR do?
the inspect API lacked any mechanism to get all
non-deprecated APIs (v1, v1alpha, v1beta)
change default to this behavior

'v1' filter can be used for user' wanting a list
of stable APIs

## Test Plan
1. pull the PR
2. launch a LLS server
3. run `curl http://beanlab3.bss.redhat.com:8321/v1/inspect/routes`
4. note there are APIs for `v1`, `v1alpha`, and `v1beta` but no
deprecated APIs

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>

src/llama_stack/apis/inspect/inspect.py

@@ -76,7 +76,7 @@ class Inspect(Protocol):
 
         List all available API routes with their methods and implementing providers.
 
-        :param api_filter: Optional filter to control which routes are returned. Can be an API level ('v1', 'v1alpha', 'v1beta') to show non-deprecated routes at that level, or 'deprecated' to show deprecated routes across all levels. If not specified, returns only non-deprecated v1 routes.
+        :param api_filter: Optional filter to control which routes are returned. Can be an API level ('v1', 'v1alpha', 'v1beta') to show non-deprecated routes at that level, or 'deprecated' to show deprecated routes across all levels. If not specified, returns all non-deprecated routes.
         :returns: Response containing information about all available routes.
         """
         ...

src/llama_stack/core/inspect.py

@@ -15,7 +15,6 @@ from llama_stack.apis.inspect import (
     RouteInfo,
     VersionInfo,
 )
-from llama_stack.apis.version import LLAMA_STACK_API_V1
 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
@@ -46,8 +45,8 @@ class DistributionInspectImpl(Inspect):
         # Helper function to determine if a route should be included based on api_filter
         def should_include_route(webmethod) -> bool:
             if api_filter is None:
-                # Default: only non-deprecated v1 APIs
-                return not webmethod.deprecated and webmethod.level == LLAMA_STACK_API_V1
+                # Default: only non-deprecated APIs
+                return not webmethod.deprecated
             elif api_filter == "deprecated":
                 # Special filter: show deprecated routes regardless of their actual level
                 return bool(webmethod.deprecated)