feat: add Expo and React Native framework detection and enable RN-specific rules

[athul-binu]

Summary

React Native and Expo projects are currently detected as "unknown" framework (displayed as just "React"), and the 8 existing rn-* lint rules in the plugin are never enabled in the oxlint config — they're effectively dead code.

This PR:

• Adds "expo" and "react-native" as recognized Framework types in types.ts
• Detects expo and react-native packages in FRAMEWORK_PACKAGES during project discovery, so the CLI correctly displays "Expo" or "React Native" instead of "React"
• Conditionally enables all 8 rn-* rules when framework is Expo or React Native (same pattern as NEXTJS_RULES):
  • rn-no-raw-text (error) — raw text outside <Text> crashes on RN
  • rn-no-deprecated-modules (error) — removed modules from react-native core
  • rn-no-legacy-expo-packages (warn) — deprecated Expo packages
  • rn-no-dimensions-get (warn) — non-reactive dimension API
  • rn-no-inline-flatlist-renderitem (warn) — perf issue with inline renderItem
  • rn-no-legacy-shadow-styles (warn) — legacy shadow props vs boxShadow
  • rn-prefer-reanimated (warn) — UI-thread animations over JS-thread
  • rn-no-single-element-style-array (warn) — unnecessary array allocation
• Adds "React Native" category for all rn-* rules in diagnostic output
• Adds actionable help text for each rn-* rule

Before

✓ Detecting framework. Found React.     ← wrong
  (no RN-specific diagnostics)           ← rules exist but never fire

After (tested on a real Expo project)

✓ Detecting framework. Found Expo.
✗ "SafeAreaView" was removed from react-native — use react-native-safe-area-context instead
    Import from the community package instead — deprecated modules were removed from the react-native core
⚠ Dimensions.get() does not update on screen rotation or resize — use useWindowDimensions()
    Use const { width, height } = useWindowDimensions() — it updates reactively on rotation and resize

Test plan

• pnpm build succeeds
• All 125 existing tests pass (pnpm test)
• No new files created — follows existing patterns exactly (mirrors NEXTJS_RULES approach)
• Verified on a real Expo project: framework shows as "Expo" and RN rules fire correctly

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[aidenybai]

good catch, ty