fix(next-plugin): resolve WASM in Bun isolated installs

[owjs3901]

Summary

• resolve runtime dependencies from the physical @devup-ui/next-plugin install location so Bun isolated installs can find non-hoisted WASM
• keep the lite-to-full fallback for compatibility
• add a Bun-style isolated node_modules regression fixture
• add a changepack for @devup-ui/next-plugin 1.0.86

Verification

• 132 next-plugin tests pass
• next-plugin build passes
• targeted ESLint passes
• packed next-plugin initializes DevupUI from an isolated Bun install
• changepacks calculates 1.0.85 → 1.0.86