sqlite-vec support for Responses file_search

This wires up the Files API optional dependency into sqlite_vec and
adds the localfs Files provider to our starter template, so that
Responses API file_search tool works out of the box for sqlite_vec in
that template.

Some additional testing with this provider plus some other inference
models led me to loosen the verification test results checking a bit -
not for the tool call, but just around the assistant response with the
file_search tool call. Some providers, such as OpenAI SaaS, make
multiple tool calls to resolve the query sometimes, especially when it
cannot find an answer so tries a few permutations before returning
empty results to the user in that test.

Signed-off-by: Ben Browning <bbrownin@redhat.com>

llama_stack/templates/starter/run.yaml

@@ -4,6 +4,7 @@ apis:
 - agents
 - datasetio
 - eval
+- files
 - inference
 - safety
 - scoring
@@ -75,6 +76,14 @@ providers:
       db: ${env.PGVECTOR_DB:}
       user: ${env.PGVECTOR_USER:}
       password: ${env.PGVECTOR_PASSWORD:}
+  files:
+  - provider_id: meta-reference-files
+    provider_type: inline::localfs
+    config:
+      storage_dir: ${env.FILES_STORAGE_DIR:~/.llama/distributions/starter/files}
+      metadata_store:
+        type: sqlite
+        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/starter}/files_metadata.db
   safety:
   - provider_id: llama-guard
     provider_type: inline::llama-guard