feat: bump to v0.4.0 with 0.08 MON request fee

[ericbsantana]

Summary

• Adapter requestFee bumped from 0.001 MON to 0.08 MON
• New v0.4.0 addresses on Monad testnet (verifier 0x4b3f…940B, adapter 0xa327…4668)
• v0.3.0 demoted to deprecated, kept on the deployments page for history
• Oracle public key unchanged - ORACLE_K does not rotate, only ADAPTER_ADDRESS is swapped server-side
• No src/contracts/ changes; requestFee is immutable, so the bump is a redeploy

Changes

• packages/docs/.vitepress/theme/lib/deployments.ts - add v0.4.0 entry, mark active, demote v0.3.0, update requestFee/requestFeeWei
• packages/docs/content/guide/deployments.md - new v0.4.0 section, deploy-tx table, post-deploy verification block, "why v0.4.0" prose; v0.3.0 moved under "Deprecated"; oracle-public-key heading and "Verifying addresses" block point at v0.4.0
• README.md - live deployment table, fee text, sample integration address
• package.json, packages/protokoll/package.json - 0.3.0 → 0.4.0

On-chain verification

requestFee()         → 80000000000000000  (0.08 MON ✓)
verifier()           → 0x4b3fDB4bdE739B75b697751B81690707c0F1940B ✓
CALLBACK_GAS_LIMIT() → 200000 ✓
oraclePublicKey()    → 128 bytes (matches v0.3.0 key) ✓