feat: input default values (#13)

* feat: add default property to input schema definition

Add `default` field to the input definition in the JSON schema, aligning
the schema with the Rust types that already support it. Includes a
schema validation test for inputs with defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: update GitHub org from ion-ash to mcpmux

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

---------

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: its-mash

README.md

@@ -511,7 +511,7 @@ pnpm build                       # Generate bundle/bundle.json
 | **McpMux Desktop App** | [Download](https://mcpmux.com/download) — Windows, macOS, Linux |
 | **Discover Servers** | [mcpmux.com](https://mcpmux.com) — browse, search, and install MCP servers |
 | **Features** | [mcpmux.com/features](https://mcpmux.com/features) — Spaces, Feature Sets, encrypted credentials, and more |
-| **Source Code** | [github.com/ion-ash/mcp-mux](https://github.com/ion-ash/mcp-mux) |
+| **Source Code** | [github.com/mcpmux/mcp-mux](https://github.com/mcpmux/mcp-mux) |
 
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