CAMEL-23529: camel-jbang-mcp - add ascii/unicode theme support to route diagram tool

[davsclaus]

Summary

• Extends the camel_render_route_diagram MCP tool to support ascii and unicode themes in addition to the existing PNG image themes (dark, light, transparent)
• For text themes the ASCII diagram is returned directly in the asciiDiagram field of RouteDiagramResult, enabling LLM callers to read and reason about the route structure without opening a file
• Temporary output file uses a .txt suffix in text mode so CamelRouteDiagramAction writes to the correct path (previously only .png was used, which caused the action to silently write to a different path)
• Updated @ToolArg descriptions to document the new theme values and the dual-mode behaviour
• Added two new test cases (ascii and unicode theme validation paths)

Changes

• RouteDiagramTools.java — detect text themes, use .txt temp file, read content and populate asciiDiagram
• RouteDiagramResult record — new asciiDiagram field (null for image themes)
• RouteDiagramToolsTest.java — two new validation tests for ascii/unicode themes

Test plan

• All 233 unit tests in camel-jbang-mcp pass (mvn test in module)
• Full mvn clean install -DskipTests from repo root passes

Fixes: https://issues.apache.org/jira/browse/CAMEL-23529

Claude Code on behalf of Claus Ibsen

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