chore: Bump version to 0.1.2

Updated all version references from 0.1.1 to 0.1.2:
- Workspace version in llmx-rs/Cargo.toml
- Package version in llmx-cli/package.json
- Updated Cargo.lock with all workspace crate versions
- Updated test hardcoded version strings in:
  - mcp-server/tests/common/mcp_process.rs
  - app-server/tests/suite/user_agent.rs
  - app-server/tests/common/mcp_process.rs
- Updated TUI snapshot tests with new version number

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

llmx-rs/app-server/tests/common/mcp_process.rs

@@ -138,7 +138,7 @@ impl McpProcess {
             client_info: ClientInfo {
                 name: "llmx-app-server-tests".to_string(),
                 title: None,
-                version: "0.1.1".to_string(),
+                version: "0.1.2".to_string(),
             },
         })?);
         let req_id = self.send_request("initialize", params).await?;