docs: Link contributing guide in README and clarify PR submission to dev branch in CONTRIBUTING.md.

CONTRIBUTING.md

@@ -169,10 +169,12 @@ For releases, GitHub Actions builds architecture-specific binaries automatically
 
 ## Pull Requests
 
-1. Fork and create branch
+> **Important:** Please submit PRs to the `dev` branch, not `main`. We merge `dev` into `main` after testing.
+
+1. Fork and create branch from `dev`
 2. Make changes
 3. Run checks: `./scripts/check.sh`
 4. Commit and push
-5. Open PR
+5. Open PR targeting `dev`
 
 CI will verify formatting, linting, and tests.

README.md

@@ -245,7 +245,7 @@ Users from around the world are loving Mole! Join the community and share your e
 <a href="https://miaoyan.app/cats.html?name=Mole"><img src="https://miaoyan.app/assets/sponsors.svg" width="1000px" /></a>
 
 - If Mole saved you space, consider starring the repo or sharing it with friends who need a cleaner Mac.
-- Have ideas or fixes? Open an issue or PR to help shape Mole's future with the community.
+- Have ideas or fixes? Check our [Contributing Guide](CONTRIBUTING.md), then open an issue or PR to help shape Mole's future.
 - Love cats? Treat Tangyuan and Cola to canned food via <a href="https://miaoyan.app/cats.html?name=Mole" target="_blank">this link</a> to keep our mascots purring.
 
 ## License