refactor: use relative paths for vendored Flare imports

[thedavidmeister]

Summary

• Drop the flare-smart-contracts/=src/vendor/... and flare-smart-contracts-v2/=... remappings from foundry.toml.
• Rewrite source imports that used them to relative paths into src/vendor/.
• Downstream soldeer consumers (e.g. rain.vats) no longer need a bridge remapping to pull these interfaces transitively — the relative paths resolve correctly whether rain.flare is at ./src/... or dependencies/rain-flare-X.Y.Z/src/....

Closes #34.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Refactor
  • Reorganized dependency import structure across library contracts, interfaces, and test files to use consistent local vendor paths instead of package-style import mappings.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 085f2097-2f9f-4069-aaf8-778990044f20

📥 Commits

Reviewing files that changed from the base of the PR and between bd45eed and 0d0494f.

📒 Files selected for processing (8)

• foundry.toml
• src/err/ErrFtso.sol
• src/interface/IGoverned.sol
• src/lib/lts/LibFtsoV2LTS.sol
• src/lib/price/LibFtsoCurrentPriceUsd.sol
• src/lib/registry/LibFlareContractRegistry.sol
• test/prod/FlareInterfacesProd.t.sol
• test/src/lib/lts/LibFtsoV2LTS.t.sol

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Walkthrough

This PR systematically converts all imports of vendored Flare interfaces from package-style paths (resolved via foundry.toml remappings) to direct relative paths. The foundry.toml remappings are removed, and all source and test files update their imports to reference src/vendor/ using relative paths.

Changes

Import Path Refactoring

Layer / File(s)	Summary
Build configuration and source file imports foundry.toml, src/err/ErrFtso.sol, src/interface/IGoverned.sol, src/lib/lts/LibFtsoV2LTS.sol, src/lib/price/LibFtsoCurrentPriceUsd.sol, src/lib/registry/LibFlareContractRegistry.sol	Removes the remappings block from foundry.toml that aliased flare-smart-contracts/ and flare-smart-contracts-v2/ namespaces. Source files update IFtso, IGovernanceSettings, FtsoV2Interface, IFeeCalculator, IFtsoRegistry, and IFlareContractRegistry imports to relative paths pointing into ../vendor/ or ../../vendor/.
Test file imports test/prod/FlareInterfacesProd.t.sol, test/src/lib/lts/LibFtsoV2LTS.t.sol	Updates test files to import the same Flare interface contracts via relative paths under src/vendor/ instead of non-relative package paths.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-14-relative-vendor-imports

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