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
```

.pre-commit-config.yaml

@@ -30,6 +30,7 @@ repos:
     rev: v0.9.4
     hooks:
     -   id: ruff
+        exclude: ^llama_stack/strong_typing/.*$
     -   id: ruff-format
 
 -   repo: https://github.com/adamchainz/blacken-docs
@@ -43,7 +44,13 @@ repos:
     rev: 0.5.26
     hooks:
     -   id: uv-export
-        args: ["--frozen", "--no-hashes", "--no-emit-project"]
+        args: [
+            "--frozen", 
+            "--no-hashes", 
+            "--no-emit-project", 
+            "--output-file=requirements.txt"
+        ]
+        files: ^pyproject\.toml$
     -   id: uv-sync
 
 # -   repo: https://github.com/pre-commit/mirrors-mypy