docs: fix broken anchor line and stale org name in badge URLs

[memosr]

Summary

Two small documentation link fixes.

Changes

1. scripts/multiproof/README.md (line 11) — Wrong anchor line number

- [`MockDevTEEProverRegistry.addDevSigner()`](https://github.com/base/contracts/blob/main/test/mocks/MockDevTEEProverRegistry.sol#L22)
+ [`MockDevTEEProverRegistry.addDevSigner()`](https://github.com/base/contracts/blob/main/test/mocks/MockDevTEEProverRegistry.sol#L30)

The link is supposed to point to the addDevSigner() function definition. Line 22 lands inside the constructor body — the function is actually defined at line 30. Anyone clicking through to understand the dev signer bypass mechanism lands in the wrong place.

2. README.md — Stale base-org/contracts in 7 shield.io badge URLs

The repo's actual path is github.com/base/contracts (confirmed via git remote -v), and the linked targets already point to the correct location. But all 7 badge image URLs still query stats via the old base-org/contracts path:

- https://img.shields.io/github/contributors/base-org/contracts
- https://img.shields.io/github/commit-activity/w/base-org/contracts
- https://img.shields.io/github/stars/base-org/contracts.svg
- https://img.shields.io/github/repo-size/base-org/contracts
- https://img.shields.io/github/license/base-org/contracts?color=blue
- https://img.shields.io/github/issues-pr-raw/base-org/contracts
- https://img.shields.io/github/issues-raw/base-org/contracts.svg
+ https://img.shields.io/github/contributors/base/contracts
+ https://img.shields.io/github/commit-activity/w/base/contracts
+ https://img.shields.io/github/stars/base/contracts.svg
+ https://img.shields.io/github/repo-size/base/contracts
+ https://img.shields.io/github/license/base/contracts?color=blue
+ https://img.shields.io/github/issues-pr-raw/base/contracts
+ https://img.shields.io/github/issues-raw/base/contracts.svg

Shields.io fetches stats from GitHub's API using the path provided. If GitHub's redirect doesn't transparently pass through to the API for stats endpoints, the badges either show stale numbers or fail silently.

Verification

• ✅ Only README files touched
• ✅ Anchor line 30 confirmed against test/mocks/MockDevTEEProverRegistry.sol
• ✅ All 7 badge URLs updated to current org path

[cb-heimdall]

🟡 Heimdall Review Status

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