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

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

llmx-rs/Cargo.toml

@@ -43,7 +43,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.1.1"
+version = "0.1.2"
 # Track the edition for all workspace crates in one place. Individual
 # crates can still override this value, but keeping it here means new
 # crates created with `cargo new -w ...` automatically inherit the 2024