fix(ch32v): validate framework selection

[zackees]

Closes #1108

Summary:

• reject unsupported CH32V framework values with an actionable error
• label the four existing Arduino builds as framework = arduino
• advertise arduino on the two missing CH32V board definitions

Validation:

• soldr rustfmt --check crates/fbuild-build-mcu/src/ch32v/orchestrator.rs
• targeted soldr cargo test was attempted but the shared Windows toolchain did not return within the local validation window

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Configuration used: Path: .coderabbit.yaml

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Run ID: 715bfab7-9a45-4356-a487-cd9fde41286b

📥 Commits

Reviewing files that changed from the base of the PR and between c2747c9 and 96bf279.

📒 Files selected for processing (7)

• crates/fbuild-build-mcu/src/ch32v/orchestrator.rs
• crates/fbuild-config/assets/boards/json/genericCH32V208WBU6.json
• crates/fbuild-config/assets/boards/json/genericCH32V303VCT6.json
• tests/platform/ch32v103/platformio.ini
• tests/platform/ch32v208/platformio.ini
• tests/platform/ch32v303/platformio.ini
• tests/platform/ch32x035/platformio.ini

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ch32v-framework-validation

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