feat: PromptRegistry 注册/版本/渲染（jinja2）

tests/test_inference_prompt_registry.py

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+import pytest
+
+from genesis.inference.prompt_registry import PromptRegistry
+from genesis.inference.types import Prompt
+
+
+def test_register_and_render():
+    reg = PromptRegistry()
+    reg.register("writer", "v1", "按规则撰写：{{ chapter }}")
+    assert reg.get("writer", "v1") == "按规则撰写：{{ chapter }}"
+
+
+def test_get_with_variables_renders():
+    reg = PromptRegistry()
+    reg.register("writer", "v1", "按规则撰写：{{ chapter }}")
+    assert reg.get("writer", "v1", {"chapter": "帳票設計"}) == "按规则撰写：帳票設計"
+
+
+def test_get_latest_version():
+    reg = PromptRegistry()
+    reg.register("writer", "v1", "t1")
+    reg.register("writer", "v2", "t2")
+    assert reg.get("writer") == "t2"
+    assert reg.list_versions("writer") == ["v1", "v2"]
+
+
+def test_get_missing_raises_keyerror():
+    reg = PromptRegistry()
+    with pytest.raises(KeyError):
+        reg.get("dne")
+
+
+def test_get_missing_version_raises_keyerror():
+    reg = PromptRegistry()
+    reg.register("writer", "v1", "t1")
+    with pytest.raises(KeyError):
+        reg.get("writer", "v9")
+
+
+def test_render_raw():
+    reg = PromptRegistry()
+    assert reg.render("{{ a }} と {{ b }}", {"a": "x", "b": 1}) == "x と 1"