docs: fix README and contributing typos

[YforC]

Summary

Fix small documentation and issue-template mistakes reported in #33.

Related Issues / Tickets

• Closes docs(readme): fix typos and broken links in README and CONTRIBUTING #33

Changes in Detail

• Fix the README license badge link to point to LICENSE.md.
• Correct the Kotlin @ServiceProvider(MyContract::class) example.
• Fix spelling in README.md and CONTRIBUTING.md.
• Remove the unrelated Paper server placeholder from the bug report template.

Modules Affected

• spi-tooling-annotations
• spi-tooling-processor
• Other: documentation and issue template

Versioning

• Version bump applied (release PR)
• Snapshot only (PR build)

Testing

• Steps:
  1. Ran rg for the old typo/link/template strings.
  2. Confirmed no old strings remain.

Checklist

• Code builds locally without errors
• All tests pass locally (./gradlew kotest)
• Added/updated tests for new or changed logic
• Updated documentation / README if needed
• No unrelated changes included

Notes for Reviewers

This is a docs/template-only cleanup, so no Gradle test run was needed.

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