fix: add pub(super) visibility to tool_router and prompt_router macros

[decoded-brain]

Problem

The #[tool_router] and #[prompt_router] macros from rmcp generate private associated functions by default. Since src/mcp/handler.rs calls these generated functions (Self::tool_router() and Self::prompt_router()) from a sibling module, the Rust compiler rejects the code with a visibility error:

error[E0624]: associated function `tool_router` is private
  --> src/mcp/handler.rs

This means cargo install rust-doctor fails to compile.

Fix

Added vis = "pub(super)" to both macro invocations in src/mcp/tools.rs:

-#[tool_router]
-#[prompt_router]
+#[tool_router(vis = "pub(super)")]
+#[prompt_router(vis = "pub(super)")]
 impl RustDoctorServer {

This makes the generated tool_router() and prompt_router() functions visible within the parent mcp module, allowing handler.rs to access them as intended.

Testing

• Verified that the project compiles successfully with cargo build after this change.
• No behavioral changes — this only adjusts function visibility to match the existing module structure.

[vercel]

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