[Docs] Polish plotlink-contracts README.md

[realproject7]

Summary

Polish the README.md for the plotlink-contracts repo. Benchmark against the Mint Club V2 contracts repo: https://github.com/Steemhunt/mint.club-v2-contract

Reference

Use the Mint Club V2 repo README structure as the template:

• Project overview / what it does
• Contract architecture diagram or table
• Deployed addresses (mainnet only)
• Build / test / deploy instructions
• License

Deployed Contracts (Base Mainnet only)

Contract	Address	Purpose
StoryFactory	0xfa5489b6710Ba2f8406b37fA8f8c3018e51FA229	Storyline + plot management
ZapPlotLinkV2	0x04f557F8D2806B34FC832a534c08DF514D4dfEeF	Multi-token zap (ETH/USDC/HUNT → PLOT → storyline token)

Include

• Project description (on-chain storytelling protocol, bonding curves, royalties)
• How StoryFactory works (createStoryline, chainPlot, donate)
• How ZapPlotLinkV2 works (routing: ETH via Uniswap V4, HUNT via MCV2, USDC via WETH multi-hop)
• Deployed addresses table (Base mainnet only — no testnet)
• External dependencies (MCV2_Bond, Uniswap V4, ERC-8004)
• Build: forge build, Test: forge test, Deploy scripts
• License

Acceptance Criteria

• README matches quality/structure of Mint Club V2 repo
• Mainnet deployed addresses listed
• Build/test/deploy instructions work
• Clean, professional presentation

Branch

task/447-readme-polish in plotlink-contracts repo

[realproject7]

README polished. PR #63 merged.