Fix #1000: [Bug] v0.3.10 版本 openai 接口 prompt 设置失效

[victorwon2001]

Fixes #1000

Implementation summary

Added a per-model OpenAI function-call opt-out that omits tools, preserves persona prompts, and falls back to nointent without tool handlers or few-shot messages. Added config documentation, idempotent manager migration, and focused tests.

Changes

.../main/resources/db/changelog/202608311000.sql   |  15 ++
 .../db/changelog/db.changelog-master.yaml          |   7 +
 main/xiaozhi-server/config.yaml                    |   2 +
 main/xiaozhi-server/core/connection.py             |   9 ++
 .../core/providers/llm/openai/openai.py            |  18 +++
 .../tests/test_connection_function_call.py         | 156 +++++++++++++++++++++
 main/xiaozhi-server/tests/test_openai_provider.py  | 141 +++++++++++++++++++
 7 files changed, 348 insertions(+)

Testing

• PYTHONDONTWRITEBYTECODE=1 python3 -m unittest tests.test_openai_provider tests.test_connection_function_call -v — passed, 5 tests
• PYTHONDONTWRITEBYTECODE=1 python3 -m unittest discover -s tests -p 'test_*.py' -v — passed, 5 tests
• AST/YAML/SQL validation script — passed
• git diff --check — passed
• mvn test -q in main/manager-api — blocked before tests because maven.aliyun.com was unavailable