chore: move all Llama Stack types from llama-models to llama-stack (#1098)

llama-models should have extremely minimal cruft. Its sole purpose
should be didactic -- show the simplest implementation of the llama
models and document the prompt formats, etc.

This PR is the complement to
https://github.com/meta-llama/llama-models/pull/279

## Test Plan

Ensure all `llama` CLI `model` sub-commands work:

```bash
llama model list
llama model download --model-id ...
llama model prompt-format -m ...
```

Ran tests:
```bash
cd tests/client-sdk
LLAMA_STACK_CONFIG=fireworks pytest -s -v inference/
LLAMA_STACK_CONFIG=fireworks pytest -s -v vector_io/
LLAMA_STACK_CONFIG=fireworks pytest -s -v agents/
```

Create a fresh venv `uv venv && source .venv/bin/activate` and run
`llama stack build --template fireworks --image-type venv` followed by
`llama stack run together --image-type venv` <-- the server runs

Also checked that the OpenAPI generator can run and there is no change
in the generated files as a result.

```bash
cd docs/openapi_generator
sh run_openapi_generator.sh
```

llama_stack/cli/download.py

@@ -16,8 +16,6 @@ from pathlib import Path
 from typing import Dict, List, Optional
 
 import httpx
-from llama_models.datatypes import Model
-from llama_models.sku_list import LlamaDownloadInfo
 from pydantic import BaseModel, ConfigDict
 from rich.console import Console
 from rich.progress import (
@@ -31,6 +29,8 @@ from rich.progress import (
 from termcolor import cprint
 
 from llama_stack.cli.subcommand import Subcommand
+from llama_stack.models.llama.datatypes import Model
+from llama_stack.models.llama.sku_list import LlamaDownloadInfo
 
 
 class Download(Subcommand):
@@ -454,7 +454,7 @@ def run_download_cmd(args: argparse.Namespace, parser: argparse.ArgumentParser):
         # Handle comma-separated model IDs
         model_ids = [model_id.strip() for model_id in args.model_id.split(",")]
 
-        from llama_models.sku_list import llama_meta_net_info, resolve_model
+        from llama_stack.models.llama.sku_list import llama_meta_net_info, resolve_model
 
         from .model.safety_models import (
             prompt_guard_download_info,

llama_stack/cli/model/describe.py

@@ -7,11 +7,11 @@
 import argparse
 import json
 
-from llama_models.sku_list import resolve_model
 from termcolor import colored
 
 from llama_stack.cli.subcommand import Subcommand
 from llama_stack.cli.table import print_table
+from llama_stack.models.llama.sku_list import resolve_model
 
 
 class ModelDescribe(Subcommand):

llama_stack/cli/model/list.py

@@ -6,10 +6,9 @@
 
 import argparse
 
-from llama_models.sku_list import all_registered_models
-
 from llama_stack.cli.subcommand import Subcommand
 from llama_stack.cli.table import print_table
+from llama_stack.models.llama.sku_list import all_registered_models
 
 
 class ModelList(Subcommand):

llama_stack/cli/model/prompt_format.py

@@ -8,9 +8,8 @@ import argparse
 import textwrap
 from io import StringIO
 
-from llama_models.datatypes import CoreModelId, ModelFamily, is_multimodal, model_family
-
 from llama_stack.cli.subcommand import Subcommand
+from llama_stack.models.llama.datatypes import CoreModelId, ModelFamily, is_multimodal, model_family
 
 
 class ModelPromptFormat(Subcommand):

llama_stack/cli/model/safety_models.py

@@ -6,11 +6,11 @@
 
 from typing import Any, Dict, Optional
 
-from llama_models.datatypes import CheckpointQuantizationFormat
-from llama_models.llama3.api.datatypes import SamplingParams
-from llama_models.sku_list import LlamaDownloadInfo
 from pydantic import BaseModel, ConfigDict, Field
 
+from llama_stack.models.llama.datatypes import CheckpointQuantizationFormat, SamplingParams
+from llama_stack.models.llama.sku_list import LlamaDownloadInfo
+
 
 class PromptGuardModel(BaseModel):
     """Make a 'fake' Model-like object for Prompt Guard. Eventually this will be removed."""