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0e5a8fed6c* feat: add Provider abstraction for dynamic components
Introduces a `Provider` base class that allows dynamic provision of
tools, resources, and prompts at runtime. Providers are queried after
static components, enabling database-backed tools, external integrations,
and other dynamic component sources.
```python
from fastmcp import FastMCP, Provider
class DatabaseProvider(Provider):
async def list_tools(self, context):
return await db.fetch_tools()
mcp = FastMCP("Server", providers=[DatabaseProvider()])
```
* Add execution methods to Provider interface
Enable providers to customize how components are executed, not just listed.
This unlocks MountedProvider (future) invoking wrapped server middleware.
- call_tool, read_resource, read_resource_template, render_prompt
- Server uses provider execution methods after filter checks
- Default implementations delegate to component methods
* Apply unified error handling to provider execution
- Document error semantics: list_* gracefully degrades, execution propagates
- Wrap provider call_tool/read_resource/render_prompt with masking logic
- ToolError/ResourceError/PromptError pass through, others wrapped
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