chore: initial import of standalone agentscope project

.github/copilot-instructions.md

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+# AgentScope Code Review Guide
+
+You should conduct a strict code review. Each requirement is labeled with priority:
+- **[MUST]** must be satisfied or PR will be rejected
+- **[SHOULD]** strongly recommended
+- **[MAY]** optional suggestion
+
+## 1. Code Quality
+
+### [MUST] Lazy Loading
+- Third-party library dependencies should be imported at the point of use, avoid centralized imports at file top
+  - The `Third-party library` refers to libraries not included in the `dependencies` variable in `pyproject.toml`.
+- For base class imports, use factory pattern:
+```python
+def get_xxx_cls() -> "MyClass":
+    from xxx import BaseClass
+    class MyClass(BaseClass): ...
+    return MyClass
+```
+
+### [SHOULD] Code Conciseness
+After understanding the code intent, check if it can be optimized:
+- Avoid unnecessary temporary variables
+- Merge duplicate code blocks
+- Prioritize reusing existing utility functions
+
+### [MUST] Encapsulation Standards
+- All Python files under `src/agentscope` should be named with `_` prefix, and exposure controlled through `__init__.py`
+- Classes and functions used internally by the framework that don't need to be exposed to users must be named with `_` prefix
+
+## 2. [MUST] Code Security
+- Prohibit hardcoding API keys/tokens/passwords
+- Use environment variables or configuration files for management
+- Check for debug information and temporary credentials
+- Check for injection attack risks (SQL/command/code injection, etc.)
+
+## 3. [MUST] Testing & Dependencies
+- New features must include unit tests
+- New dependencies need to be added to the corresponding section in `pyproject.toml`
+- Dependencies for non-core scenarios should not be added to the minimal dependency list
+
+## 4. Code Standards
+
+### [MUST] Comment Standards
+- **Use English**
+- All classes/methods must have complete docstrings, strictly following the template:
+```python
+def func(a: str, b: int | None = None) -> str:
+    """{description}
+
+    Args:
+        a (`str`):
+            The argument a
+        b (`int | None`, optional):
+            The argument b
+
+    Returns:
+        `str`:
+            The return str
+    """
+```
+- Use reStructuredText syntax for special content:
+```python
+class MyClass:
+    """xxx
+
+    `Example link <https://xxx>`_
+
+    .. note:: Example note
+
+    .. tip:: Example tip
+
+    .. important:: Example important info
+
+    .. code-block:: python
+
+        def hello_world():
+            print("Hello world!")
+
+    """
+```
+
+### [MUST] Pre-commit Checks
+- **Strict review**: In most cases, code should be modified rather than skipping checks
+- **File-level check skipping is prohibited**
+- Only allowed skip: agent class system prompt parameters (to avoid `\n` formatting issues)
+
+---
+
+## 5. Git Standards
+
+### [MUST] PR Title
+- Follow Conventional Commits
+- Must use prefixes: `feat/fix/docs/ci/refactor/test`, etc.
+- Format: `feat(scope): description`
+- Example: `feat(memory): add redis cache support`