feat: add multi-entry encrypt/decrypt with YAML import/export

[pedrordgs]

Summary

• Add encryptMultiple and decryptMultiple server actions to support batch operations on multiple vault entries in a single request
• Refactor encrypt and decrypt forms to support multiple entries with optional labels, including per-entry error reporting
• Add lib/vault/yaml.ts utility for parsing and generating vault.yml files, with import (decrypt form) and export (encrypt form) support

Changes

• app/actions/vault.ts: New encryptMultiple/decryptMultiple actions with Zod validation and partial-failure handling
• components/vault/encrypt-form.tsx: Multi-entry UI with add/remove entries, password state, download YAML button
• components/vault/decrypt-form.tsx: Multi-entry UI with add/remove entries, import vault.yml, per-entry results
• lib/vault/yaml.ts: YAML parse/generate helpers for vault files
• app/globals.css: CSS indentation cleanup + cursor pointer fix for buttons
• app/page.tsx: Fix LICENSE link to use master branch
• CHANGELOG.md / README.md: Document v1.1.x releases and Next.js 16.1.5 upgrade

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