feat(auth): support github tokens (#2509)

# What does this PR do?

This PR adds GitHub OAuth authentication support to Llama Stack,
allowing users to
  authenticate using their GitHub credentials (#2508) . 

1. support verifying github acesss tokens
2. support provider-specific auth error messages
3. opportunistic reorganized the auth configs for better ergonomics

## Test Plan
Added unit tests.

Also tested e2e manually:
```
server:
  port: 8321
  auth:
    provider_config:
      type: github_token
```
```
~/projects/llama-stack/llama_stack/ui
❯ curl -v http://localhost:8321/v1/models
* Host localhost:8321 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:8321...
* Connected to localhost (::1) port 8321
> GET /v1/models HTTP/1.1
> Host: localhost:8321
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 401 Unauthorized
< date: Fri, 27 Jun 2025 21:51:25 GMT
< server: uvicorn
< content-type: application/json
< x-trace-id: 5390c6c0654086c55d87c86d7cbf2f6a
< Transfer-Encoding: chunked
<
* Connection #0 to host localhost left intact
{"error": {"message": "Authentication required. Please provide a valid GitHub access token (https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens) in the Authorization header (Bearer <token>)"}}
~/projects/llama-stack/llama_stack/ui
❯ ./scripts/unit-tests.sh


~/projects/llama-stack/llama_stack/ui
❯ curl "http://localhost:8321/v1/models" \
-H "Authorization: Bearer <token_obtained_from_github>" \

{"data":[{"identifier":"accounts/fireworks/models/llama-guard-3-11b-vision","provider_resource_id":"accounts/fireworks/models/llama-guard-3-11b-vision","provider_id":"fireworks","type":"model","metadata":{},"model_type":"llm"},{"identifier":"accounts/fireworks/models/llama-guard-3-8b","provider_resource_id":"accounts/fireworks/models/llama-guard-3-8b","provider_id":"fireworks","type":"model","metadata":{},"model_type":"llm"},{"identifier":"accounts/fireworks/models/llama-v3p1-405b-instruct","provider_resource_id":"accounts/f
```

---------

Co-authored-by: Claude <noreply@anthropic.com>

llama_stack/distribution/server/server.py

@@ -33,7 +33,11 @@ from pydantic import BaseModel, ValidationError
 
 from llama_stack.apis.common.responses import PaginatedResponse
 from llama_stack.distribution.access_control.access_control import AccessDeniedError
-from llama_stack.distribution.datatypes import AuthenticationRequiredError, LoggingConfig, StackRunConfig
+from llama_stack.distribution.datatypes import (
+    AuthenticationRequiredError,
+    LoggingConfig,
+    StackRunConfig,
+)
 from llama_stack.distribution.distribution import builtin_automatically_routed_apis
 from llama_stack.distribution.request_headers import PROVIDER_DATA_VAR, User, request_provider_data_context
 from llama_stack.distribution.resolver import InvalidProviderError
@@ -217,7 +221,7 @@ def create_dynamic_typed_route(func: Any, method: str, route: str) -> Callable:
         # Get auth attributes from the request scope
         user_attributes = request.scope.get("user_attributes", {})
         principal = request.scope.get("principal", "")
-        user = User(principal, user_attributes)
+        user = User(principal=principal, attributes=user_attributes)
 
         await log_request_pre_validation(request)
 
@@ -455,7 +459,7 @@ def main(args: argparse.Namespace | None = None):
 
     # Add authentication middleware if configured
     if config.server.auth:
-        logger.info(f"Enabling authentication with provider: {config.server.auth.provider_type.value}")
+        logger.info(f"Enabling authentication with provider: {config.server.auth.provider_config.type.value}")
         app.add_middleware(AuthenticationMiddleware, auth_config=config.server.auth)
     else:
         if config.server.quota: