refactor: ci and eslint improvements

[saberzero1]

This pull request modernizes and restructures the project's linting and CI/CD setup. It migrates from a legacy .eslintrc.js configuration to the new flat config format with eslint.config.mts, updates lint scripts and dependencies, and introduces improved GitHub Actions workflows for CI and releases. The changes ensure better maintainability, compatibility with the latest tools, and improved automation.

Linting configuration migration and improvements:

• Migrated from the legacy .eslintrc.js to the new flat config format in eslint.config.mts, using the eslint-plugin-obsidianmd recommended config and improved global ignores.
• Updated package.json lint scripts to use the new config and lint the entire project, not just the src directory.
• Updated and added ESLint-related dependencies to align with the new config format and plugins.

CI/CD workflow enhancements:

• Added a new .github/workflows/ci.yml workflow to run lint, typecheck, and test jobs on pushes and pull requests, ensuring code quality and type safety.
• Refactored .github/workflows/release.yml to use a two-stage process: a ci job that runs checks and a release job that builds, attests, and creates releases, with updated Node.js version and improved permissions.

Dependency updates:

• Updated several development dependencies in package.json, including eslint, typescript, and added eslint-plugin-obsidianmd, globals, and others to support the new linting setup.