CAMEL-21975: Add graphical route diagram rendering to TUI monitor

[gnodet]

CAMEL-21975

Summary

• Use Tamboui's Image widget to render route diagrams as actual images (via Kitty/Sixel/iTerm2 protocols) when the terminal supports it
• Falls back to the existing text tree diagram for terminals without native image support
• Adds tamboui-image dependency to the TUI plugin module
• Makes RouteDiagramLayoutEngine and RouteDiagramRenderer classes/methods public so they can be reused from the TUI plugin
• Temporarily bumps TamboUI to 0.2.1-SNAPSHOT for testing

Blocked by TamboUI upstream issues

This PR requires fixes in TamboUI before it can be merged:

• tamboui#315 — Image placement offset within Block border (image renders garbled at top)
• tamboui#316 — Missing Kitty graphics delete command (image persists after widget is removed)
• tamboui#317 — Blurry image rendering (not querying terminal cell pixel size for proper scaling)

Once these are fixed and released, we need to update tamboui-version in parent/pom.xml to the release containing the fixes.

Test plan

• Start a Camel integration, run camel tui monitor, go to Routes tab, select a route, press d
• Verify graphical diagram appears in terminals with Kitty/Sixel/iTerm2 support (Ghostty, kitty, WezTerm, iTerm2)
• Verify text diagram appears in terminals without native image support
• Verify Esc or d closes the diagram
• Verify scroll works in text diagram mode (arrow keys, PgUp/PgDn, mouse wheel)

🤖 Generated with Claude Code

[github-actions]

🌟 Thank you for your contribution to the Apache Camel project! 🌟
🤖 CI automation will test this PR automatically.

🐫 Apache Camel Committers, please review the following items:

• First-time contributors require MANUAL approval for the GitHub Actions to run
• You can use the command /component-test (camel-)component-name1 (camel-)component-name2.. to request a test from the test bot although they are normally detected and executed by CI.
• You can label PRs using skip-tests and test-dependents to fine-tune the checks executed by this PR.
• Build and test logs are available in the summary page. Only Apache Camel committers have access to the summary.

⚠️ Be careful when sharing logs. Review their contents before sharing them publicly.

[davsclaus]

this is awesome and there are many more graphical / charts etc we can display.