feat(stores)!: use backend storage references instead of configs (#3697)

**This PR changes configurations in a backward incompatible way.**

Run configs today repeat full SQLite/Postgres snippets everywhere a
store is needed, which means duplicated credentials, extra connection
pools, and lots of drift between files. This PR introduces named storage
backends so the stack and providers can share a single catalog and
reference those backends by name.

## Key Changes

- Add `storage.backends` to `StackRunConfig`, register each KV/SQL
backend once at startup, and validate that references point to the right
family.
- Move server stores under `storage.stores` with lightweight references
(backend + namespace/table) instead of full configs.
- Update every provider/config/doc to use the new reference style;
docs/codegen now surface the simplified YAML.

## Migration

Before:
```yaml
metadata_store:
  type: sqlite
  db_path: ~/.llama/distributions/foo/registry.db
inference_store:
  type: postgres
  host: ${env.POSTGRES_HOST}
  port: ${env.POSTGRES_PORT}
  db: ${env.POSTGRES_DB}
  user: ${env.POSTGRES_USER}
  password: ${env.POSTGRES_PASSWORD}
conversations_store:
  type: postgres
  host: ${env.POSTGRES_HOST}
  port: ${env.POSTGRES_PORT}
  db: ${env.POSTGRES_DB}
  user: ${env.POSTGRES_USER}
  password: ${env.POSTGRES_PASSWORD}
```

After:
```yaml
storage:
  backends:
    kv_default:
      type: kv_sqlite
      db_path: ~/.llama/distributions/foo/kvstore.db
    sql_default:
      type: sql_postgres
      host: ${env.POSTGRES_HOST}
      port: ${env.POSTGRES_PORT}
      db: ${env.POSTGRES_DB}
      user: ${env.POSTGRES_USER}
      password: ${env.POSTGRES_PASSWORD}
  stores:
    metadata:
      backend: kv_default
      namespace: registry
    inference:
      backend: sql_default
      table_name: inference_store
      max_write_queue_size: 10000
      num_writers: 4
    conversations:
      backend: sql_default
      table_name: openai_conversations
```

Provider configs follow the same pattern—for example, a Chroma vector
adapter switches from:

```yaml
providers:
  vector_io:
  - provider_id: chromadb
    provider_type: remote::chromadb
    config:
      url: ${env.CHROMADB_URL}
      kvstore:
        type: sqlite
        db_path: ~/.llama/distributions/foo/chroma.db
```

to:

```yaml
providers:
  vector_io:
  - provider_id: chromadb
    provider_type: remote::chromadb
    config:
      url: ${env.CHROMADB_URL}
      persistence:
        backend: kv_default
        namespace: vector_io::chroma_remote
```

Once the backends are declared, everything else just points at them, so
rotating credentials or swapping to Postgres happens in one place and
the stack reuses a single connection pool.

llama_stack/providers/remote/vector_io/weaviate/config.py

@@ -8,10 +8,7 @@ from typing import Any
 
 from pydantic import BaseModel, Field
 
-from llama_stack.providers.utils.kvstore.config import (
-    KVStoreConfig,
-    SqliteKVStoreConfig,
-)
+from llama_stack.core.storage.datatypes import KVStoreReference
 from llama_stack.schema_utils import json_schema_type
 
 
@@ -19,7 +16,9 @@ from llama_stack.schema_utils import json_schema_type
 class WeaviateVectorIOConfig(BaseModel):
     weaviate_api_key: str | None = Field(description="The API key for the Weaviate instance", default=None)
     weaviate_cluster_url: str | None = Field(description="The URL of the Weaviate cluster", default="localhost:8080")
-    kvstore: KVStoreConfig | None = Field(description="Config for KV store backend (SQLite only for now)", default=None)
+    persistence: KVStoreReference | None = Field(
+        description="Config for KV store backend (SQLite only for now)", default=None
+    )
 
     @classmethod
     def sample_run_config(
@@ -30,8 +29,8 @@ class WeaviateVectorIOConfig(BaseModel):
         return {
             "weaviate_api_key": None,
             "weaviate_cluster_url": "${env.WEAVIATE_CLUSTER_URL:=localhost:8080}",
-            "kvstore": SqliteKVStoreConfig.sample_run_config(
-                __distro_dir__=__distro_dir__,
-                db_name="weaviate_registry.db",
-            ),
+            "persistence": KVStoreReference(
+                backend="kv_default",
+                namespace="vector_io::weaviate",
+            ).model_dump(exclude_none=True),
         }

llama_stack/providers/remote/vector_io/weaviate/weaviate.py

@@ -320,8 +320,8 @@ class WeaviateVectorIOAdapter(
     async def initialize(self) -> None:
         """Set up KV store and load existing vector DBs and OpenAI vector stores."""
         # Initialize KV store for metadata if configured
-        if self.config.kvstore is not None:
-            self.kvstore = await kvstore_impl(self.config.kvstore)
+        if self.config.persistence is not None:
+            self.kvstore = await kvstore_impl(self.config.persistence)
         else:
             self.kvstore = None
             log.info("No kvstore configured, registry will not persist across restarts")