fix(ch32v): inject validated system clock define

[zackees]

Closes #1119\n\nCarry board clock_source metadata into BoardConfig and emit the exact OpenWCH SYSCLK_FREQ_* define alongside F_CPU. Validate supported per-series frequencies so firmware cannot silently fall back to the reset HSI clock.\n\nValidation: soldr cargo test -p fbuild-config board --lib (105 passed); soldr cargo test -p fbuild-build-mcu ch32v::orchestrator --lib (9 passed); rustfmt checks.

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Reviewing files that changed from the base of the PR and between 8973b01 and 158a8ea.

📒 Files selected for processing (4)

• crates/fbuild-build-mcu/src/ch32v/orchestrator.rs
• crates/fbuild-config/src/board/db.rs
• crates/fbuild-config/src/board/loaders.rs
• crates/fbuild-config/src/board/types.rs

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