solid-v2: switch fullstack templates from zod to valibot

[brenelz]

Summary

Switches the solid-v2/fullstack and solid-v2/fullstack-tanstack templates from zod to valibot:

• env.ts in both templates rewritten with valibot (v.pipe(v.string(), v.minLength(32)) for SESSION_SECRET, v.optional(v.pipe(v.string(), v.minLength(1)), 'Solid App') for VITE_APP_NAME); the comment now lists zod/arktype as the alternatives
• package.json deps: zod → valibot@^1.4.2, lockfiles regenerated
• fullstack/README.md updated to name valibot in the Standard Schema paragraph and the server-bundle deps list

The env plugin consumes the Standard Schema interface, so only the example library changes — no plugin or config changes.

Verification

• Both templates build cleanly (client env values are validated at build time, exercising the valibot schemas)
• Both vitest suites pass (10/10 each)
• solid-env.d.ts regenerates with correct inferred types from valibot's Standard Schema output

Companion docs PR: solidjs/solid-docs#1634

🤖 Generated with Claude Code

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