chore: implement commitlint with conventional commits standard

.husky/commit-msg

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+npx --no -- commitlint --edit "$1"

CONTRIBUTING.md

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+# Contributing to TradeFlow-Web
+
+Thank you for your interest in contributing! Please follow the guidelines below to keep our codebase clean and consistent.
+
+---
+
+## Commit Message Convention
+
+This project enforces [Conventional Commits](https://www.conventionalcommits.org/) using **Commitlint** and **Husky**.
+
+Every commit message must follow this format:
+
+\`\`\`
+type(scope): subject
+\`\`\`
+
+### Examples
+
+\`\`\`
+feat: add wallet modal
+fix(api): resolve CORS issue
+chore: update dependencies
+docs: update README setup steps
+refactor(auth): simplify token validation logic
+test(dashboard): add unit tests for chart component
+\`\`\`
+
+### Allowed Types
+
+| Type     | Description                               |
+| -------- | ----------------------------------------- |
+| feat     | A new feature                             |
+| fix      | A bug fix                                 |
+| chore    | Maintenance tasks (deps, config, tooling) |
+| docs     | Documentation changes only                |
+| refactor | Code change that is not a fix or feature  |
+| test     | Adding or updating tests                  |
+| style    | Formatting, missing semicolons, etc.      |
+| perf     | Performance improvements                  |
+| ci       | CI/CD configuration changes               |
+| build    | Changes affecting the build system        |
+
+### Rules
+
+- The type is **required**
+- The subject is **required** and must not be empty
+- Use **lowercase** for type and subject
+- No period at the end of the subject line
+
+Commits that do not follow this format will be **rejected** by the commit hook.
+
+---
+
+## Running Locally
+
+\`\`\`bash
+npm install
+npm run dev
+\`\`\`
+
+---
+
+## Pull Request Guidelines
+
+- Branch off from main
+- Keep PRs focused and small
+- Reference the related issue in your PR description (e.g., Closes #259)

commitlint.config.cjs

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+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+};