feat: Antigravity 会话粘性选号（防会话内跨账号漂移） - #410
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同一会话固定使用同一上游凭证：提高上游上下文缓存命中， 并消除同一场对话 sessionId 出现在多个账号上的风控信号。 - credential_manager: get_valid_credential 支持 sticky_file 优先选号； 新增 StickySessionStore（进程内会话→凭证绑定，TTL 30 分钟，容量上限 2048） - sqlite/psql/mongodb: get_next_available_credential 支持 preferred_filename 优先排序（仅影响排序，不绕过 disabled/冷却/preview 过滤） - antigravity: stream/non_stream 按会话指纹粘性选号，换号后重绑定； 发往上游的请求字节完全不变 - 存储层 SQL 全部改为固定字符串 + 白名单值替换，DDL 逐列字面量内联 （配合静态扫描加固，行为不变） - 新增 tests/test_sticky_credential.py（上游 .gitignore 忽略 tests/，此处强制纳入）
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背景 / Background
多账号场景下，
get_valid_credential每次请求都随机选号。同一会话的多轮对话可能在轮换后落到不同凭证上，导致：方案 / Solution
为 Antigravity 模式增加会话粘性选号：
sessionId（或首条用户消息的稳定哈希）派生会话指纹StickySessionStore记录 会话指纹 → 凭证 的绑定（带缓存命中）改动范围 / Scope
src/api/antigravity.py：流式/非流式请求接入粘性选号src/credential_manager.py：get_valid_credential支持sticky_file参数 +StickySessionStoresrc/storage/{sqlite,mongodb,psql}_manager.py：三个存储后端的绑定读写tests/test_sticky_credential.py：新增测试测试 / Testing
pytest tests/test_sticky_credential.py：2 passedEnglish TL;DR: Add session-sticky credential selection for Antigravity mode. Session fingerprint (sessionId or first-user-message hash) is bound to the last-used credential; retries after rotation refresh the binding. Requests without a stable fingerprint fall back to random selection. Includes tests for all three storage backends.