chore(scripts): improve Solana scripts

[xenoliss]

Modular Solana CLI and standalone TypeScript client

• Introduces scripts package: Bun/TypeScript CLI with modular commands (using commander and @clack/prompts).
• Onchain commands: init, prove/relay (Base→Solana), bridge (Solana→Base) for SOL/SPL/wrapped tokens, call-buffer ops.
• SPL utilities: create-ata, create-mint, mint.
• Program tooling: build, deploy, generate IDL and TS client.
• Internal modules moved under scripts/src/internal/** (typed helpers, EVM ABIs, logger, transactions, constants).
• Creates clients/ts package with regenerated bindings in src/generated/** and public exports in src/index.ts.
• Adds solana/programs/bridge/idl.json; refreshes generated types/exports.
• Removes legacy solana/scripts/** and related utilities; migrates configs and .gitignore.
• No on-chain logic changes; this is tooling/client reorganization.

[cb-heimdall]

🟡 Heimdall Review Status

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