修复: 协议层与体验缺陷六件

- temperature 按模型适配,仅收 1 的模型不再 400
- 流式 error 帧不再被 choices 必填整帧丢弃
- 只读缓存写后失效
- git diff 中文截断撞 UTF-8 边界 panic
- 非视觉模型纯图片直接拒绝
- 全局快捷键补输入焦点守卫

crates/df-ai/src/context/manager_tests.rs

@@ -841,12 +841,12 @@ fn phase1_push_only_keeps_clean_no_dirty_flag() {
 
 #[test]
 fn phase1_advance_persisted_count_sets_baseline_and_clears_dirty() {
-    // advance_persisted_count(new_count):推进基线 + 清 needs_full_rewrite(DB 已与内存一致)
+    // advance_persisted_count(new_count, full):推进基线;全量重写才清 needs_full_rewrite
     let mut mgr = ContextManager::new(cfg(100_000));
     mgr.push(ChatMessage::user("x"));
     mgr.push(ChatMessage::user("y"));
-    // 模拟 save 成功后推进
-    mgr.advance_persisted_count(2);
+    // 模拟 save(全量重写)成功后推进
+    mgr.advance_persisted_count(2, true);
     assert_eq!(mgr.persisted_msg_count(), 2);
     assert!(!mgr.needs_full_rewrite());
 }
@@ -855,11 +855,26 @@ fn phase1_advance_persisted_count_sets_baseline_and_clears_dirty() {
 fn phase1_advance_persisted_count_max_no_regression() {
     // 防回退:advance 传更小值不回退基线(防误传 / 并发致基线丢失 → 下次增量漏写)
     let mut mgr = ContextManager::new(cfg(100_000));
-    mgr.advance_persisted_count(5);
-    mgr.advance_persisted_count(3); // 误传更小
+    mgr.advance_persisted_count(5, true);
+    mgr.advance_persisted_count(3, true); // 误传更小
     assert_eq!(mgr.persisted_msg_count(), 5, "基线不可回退");
 }
 
+#[test]
+fn phase1_advance_incremental_keeps_dirty() {
+    // 增量/无变化路径(full=false)不得清 dirty:写库期间新置的 dirty(如压缩链 mark)
+    // 与本次 append 写库无关,误清会致改动滞留内存永不落库
+    let mut mgr = ContextManager::new(cfg(100_000));
+    mgr.push(ChatMessage::user("a"));
+    mgr.advance_persisted_count(1, false); // 增量 save 成功
+    assert!(!mgr.needs_full_rewrite());
+    mgr.mark_needs_full_rewrite(); // 模拟写库期间压缩 mark
+    mgr.advance_persisted_count(1, false); // 又一次增量 save
+    assert!(mgr.needs_full_rewrite(), "增量路径 advance 不得清 dirty");
+    mgr.advance_persisted_count(1, true); // 直到全量重写才清
+    assert!(!mgr.needs_full_rewrite());
+}
+
 #[test]
 fn phase1_compress_old_messages_sets_dirty() {
     // compress 改既有消息 status(active→compressed) → 必须全量重写收敛
@@ -881,7 +896,7 @@ fn phase1_compress_no_op_does_not_set_dirty() {
     mgr.push(ChatMessage::user("a"));
     let _ = mgr.compress_old_messages(1);
     assert!(mgr.needs_full_rewrite(), "首次压缩应置 dirty");
-    mgr.advance_persisted_count(1); // 模拟 save 后清 dirty
+    mgr.advance_persisted_count(1, true); // 模拟 save(全量)后清 dirty
     // 二次压缩同范围:全已 compressed,无新标 → 不应再置 dirty
     let compressed = mgr.compress_old_messages(1);
     assert!(compressed.is_empty());
@@ -974,7 +989,7 @@ fn phase1_clear_resets_baseline_and_sets_dirty() {
     // clear:基线重置 0 + 置 dirty(下次 save 全量重写空列表清 DB)
     let mut mgr = ContextManager::new(cfg(100_000));
     mgr.push(ChatMessage::user("a"));
-    mgr.advance_persisted_count(1);
+    mgr.advance_persisted_count(1, true);
     assert_eq!(mgr.persisted_msg_count(), 1);
     mgr.clear();
     assert_eq!(mgr.persisted_msg_count(), 0, "clear 应重置基线到 0");
@@ -1021,7 +1036,7 @@ fn phase1_append_after_dirty_stays_dirty_until_save() {
     mgr.push(ChatMessage::user("b")); // 追加
     assert!(mgr.needs_full_rewrite(), "dirty 后 push 不应清 dirty");
     // 模拟 save(全量重写)成功后推进 + 清
-    mgr.advance_persisted_count(2);
+    mgr.advance_persisted_count(2, true);
     assert!(!mgr.needs_full_rewrite());
 }