feat: PromptRegistry 注册/版本/渲染（jinja2）

src/genesis/inference/prompt_registry.py

@@ -0,0 +1,48 @@
+from __future__ import annotations
+
+from typing import Any
+
+from jinja2 import Template
+
+from .types import Prompt
+
+
+class PromptRegistry:
+    """Prompt 模板库：注册/取用/版本管理/渲染（集中管理待迁移 prompts/ 目录）。"""
+
+    def __init__(self) -> None:
+        self._templates: dict[tuple[str, str], str] = {}
+
+    def register(self, name: str, version: str, template: str) -> None:
+        """注册（或覆盖）一个版本的模板。"""
+        self._templates[(name, version)] = template
+
+    def get(
+        self,
+        name: str,
+        version: str | None = None,
+        variables: dict[str, Any] | None = None,
+    ) -> str:
+        """取模板；version=None 返回该 name 最新注册版本；variables 非空时渲染。"""
+        if version is None:
+            versions = self.list_versions(name)
+            if not versions:
+                raise KeyError(f"prompt not found: {name}")
+            version = versions[-1]
+        key = (name, version)
+        if key not in self._templates:
+            raise KeyError(f"prompt version not found: {name}@{version}")
+        template = self._templates[key]
+        if variables:
+            return self.render(template, variables)
+        return template
+
+    def list_versions(self, name: str) -> list[str]:
+        """返回某 name 的已注册版本（按注册顺序）。"""
+        return [v for (n, v) in self._templates if n == name]
+
+    def render(self, template: str, variables: dict[str, Any]) -> str:
+        """用 jinja2 渲染模板。"""
+        from jinja2 import Template
+
+        return Template(template).render(**variables)