docs: fix cross-chain airdrop README links

[maelrx]

Addresses Scottcjn/rustchain-bounties#2178

Summary:

• Fixed relative links in cross-chain-airdrop/README.md that used ../../ and resolved outside the repository root.
• Updated the license and contributing links so readers land on valid targets.
• Kept the change scoped to documentation link targets only.

Verification:

• Ran a local Markdown link check for cross-chain-airdrop/README.md; all local Markdown links now resolve.

Notes:

• No payment or private user details are included in this PR.

[github-actions]

Welcome to RustChain! Thanks for your first pull request.

Before we review, please make sure:

• Your PR has a BCOS-L1 or BCOS-L2 label
• New code files include an SPDX license header
• You've tested your changes against the live node

Bounty tiers: Micro (1-10 RTC) | Standard (20-50) | Major (75-100) | Critical (100-150)

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[maelrx]

I do not have repository label permissions, so I could not add the requested BCOS-L1/BCOS-L2 label myself. The PR is docs-only and currently has the documentation and size/XS labels.

[cerredz]

Docs-link review.

I checked the changed paths from cross-chain-airdrop/README.md against the repository root. The four local documentation links now resolve, and the previous LICENSE-APACHE / LICENSE-MIT files do not exist in this repo. Linking Apache text to the existing root LICENSE plus using the public MIT license URL is a reasonable docs-only repair for the current tree.

Validation performed from the repository root:

• Test-Path .\docs\RIP-305-cross-chain-airdrop.md => true
• Test-Path .\bridge\README.md => true
• Test-Path .\rips\docs\RIP-0305-solana-spl-token-deployment.md => true
• Test-Path .\airdrop\README.md => true
• Test-Path .\LICENSE and Test-Path .\CONTRIBUTING.md => true
• Test-Path .\LICENSE-APACHE and Test-Path .\LICENSE-MIT => false

No blocking findings from my review.

[Scottcjn]

💰 PAID — 2 RTC pending, will confirm in 24h.

• tx hash: f41f9ec55d958a28eab95b67316c3a3b
• Pending ID: 1407

What worked

Welcome @maelrx! Broken relative links fixed + license targets aligned with crate metadata (MIT OR Apache-2.0). Trivial tier but always paid — clean docs work earns its faucet RTC.

— auto-triage 2026-05-10