feat: 添加全局人设与头像设置并优化对话及弹窗交互

backend/tests/test_global_persona.py

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+import asyncio
+import pytest
+from app.contracts import ModelRequest, Message, ProviderConfig
+from app.errors import ApiError
+from app.services.persona_settings import PersonaSettings, DialoguePair, save_persona, load_persona, apply_global_persona
+
+
+def request():
+    return ModelRequest(provider_id="p", model="test", system="任务要求", messages=[Message(role="user", content="hello")])
+
+
+def test_global_persona_persists_and_keeps_task_prompt():
+    save_persona(PersonaSettings(name="老师", system_prompt="耐心解释", dialogue_pairs=[DialoguePair(user="问题", assistant="回答"), DialoguePair()]))
+    assert load_persona().version == 1
+    original = request()
+    assembled = apply_global_persona(original)
+    assert assembled.system == "任务要求\n\n全局人设 / Global persona\n耐心解释\n\n预设对话示例 / Example dialogue\nUser: 问题\nAssistant: 回答"
+    assert original.system == "任务要求"
+    with pytest.raises(ApiError):
+        save_persona(PersonaSettings())
+
+
+def test_empty_persona_omits_all_global_sections():
+    save_persona(PersonaSettings(system_prompt="  ", dialogue_pairs=[DialoguePair(user=" ")]))
+    assert apply_global_persona(request()).system == "任务要求"
+
+
+def test_existing_provider_reads_latest_global_persona_for_complete_and_stream(monkeypatch):
+    from app.providers.factory import ProviderFactory
+    from app.providers.base import ProviderTurn
+    seen = []
+    class Adapter:
+        async def complete(self, req):
+            seen.append(req.system)
+            return ProviderTurn(text="ok")
+        async def stream(self, req):
+            seen.append(req.system)
+            if False: yield
+    factory = ProviderFactory(None)
+    monkeypatch.setattr(factory, "_build", lambda _: Adapter())
+    adapter = factory.build(ProviderConfig(provider_id="p",name="test",provider_type="openai_compatible"))
+    save_persona(PersonaSettings(system_prompt="全局人设"))
+    async def run():
+        await adapter.complete(request())
+        async for _ in adapter.stream(request()): pass
+    asyncio.run(run())
+    assert len(seen) == 2
+    assert all(text.count("全局人设 / Global persona") == 1 for text in seen)