fix(create): replace deprecated neon db package

[ryan-ludwig]

Closes #410
Closes #401

@neondatabase/vite-plugin-postgres is deprecated in favor of
vite-plugin-db, which is deprecated and renamed to
vite-plugin-neon-new.

This PR updates the relevant package.jsons and updates the neon-vite-plugin to point to the new package.

Summary by CodeRabbit

• Chores
  • Updated the Neon database plugin dependency to a newer version. All projects using the Neon add-on will automatically use the updated plugin for database initialization, configuration, and seeding operations. This change applies across both fresh project templates and example implementations.

[changeset-bot]

⚠️ No Changeset found

Latest commit: f47c221

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 08bb6432-2dc7-4e08-9e48-69f47ca8aad3

📥 Commits

Reviewing files that changed from the base of the PR and between b8f4e63 and f47c221.

📒 Files selected for processing (5)

• examples/custom-cli/create-rwsdk/add-ons/neon/README.md
• examples/custom-cli/create-rwsdk/add-ons/neon/assets/neon-vite-plugin.ts
• examples/custom-cli/create-rwsdk/add-ons/neon/package.json
• packages/create/src/frameworks/react/add-ons/neon/assets/neon-vite-plugin.ts
• packages/create/src/frameworks/react/add-ons/neon/package.json

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📝 Walkthrough

Walkthrough

This PR migrates the deprecated @neondatabase/vite-plugin-postgres plugin to vite-plugin-neon-new across Neon add-on files. The migration updates package dependencies, import statements, and function calls from postgresPlugin to postgres while maintaining the same seed configuration.

Changes

Cohort / File(s)	Summary
Neon Plugin Implementation Updates examples/custom-cli/create-rwsdk/add-ons/neon/assets/neon-vite-plugin.ts, packages/create/src/frameworks/react/add-ons/neon/assets/neon-vite-plugin.ts	Replaced import from @neondatabase/vite-plugin-postgres to vite-plugin-neon-new and updated function call from postgresPlugin() to postgres() while preserving seed configuration.
Neon Dependency Declarations examples/custom-cli/create-rwsdk/add-ons/neon/package.json, packages/create/src/frameworks/react/add-ons/neon/package.json	Updated dependencies: removed @neondatabase/vite-plugin-postgres (v0.2.0 and v0.7.0 respectively) and added vite-plugin-neon-new (v0.8.0).
Neon Documentation examples/custom-cli/create-rwsdk/add-ons/neon/README.md	Updated plugin name reference from @neondatabase/vite-plugin-postgres to vite-plugin-neon-new.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 The old plugin wouldn't export, a tangled web we'd weave,
So we hopped to a newer branch where the dev servers believe!
From postgresPlugin to postgres, the migration's complete,
vite-plugin-neon-new makes the setup sweet! 🥕✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: replacing a deprecated Neon database package with a new one across multiple files.
Linked Issues check	✅ Passed	The PR successfully addresses both linked issues by replacing the deprecated @neondatabase/vite-plugin-postgres with vite-plugin-neon-new across all relevant files and package.json entries.
Out of Scope Changes check	✅ Passed	All changes are directly in-scope, consistently replacing the deprecated Neon plugin package with the new one in both examples and packages directories.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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