feat: support accented characters in MCP server titles

[ucodia]

Summary

Update MCP server title validation regex to use Unicode property escapes (\p{L} and \p{N}) instead of ASCII-only character classes. This allows letters from any language (French, German, Japanese, etc.) in MCP server titles. Also permits apostrophes and hyphens for titles like "Génération d'images".

Changes:

• packages/data-provider/src/mcp.ts: backend Zod validation
• client BasicInfoSection.tsx: frontend form validation
• English locale: updated error message text

Change Type

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• New feature (non-breaking change which adds functionality)

Testing

1. Create a MCP server configuration with accents and apostrophes

mcpServers:
  my-tools:
    type: sse
    url: "${MY_MCP_URL}/sse"
    title: "Générateur d'images"

2. Start up the docker stack with docker compose up -d
3. Verify in Docker logs that there are no validation errors and that the tool calls are functional.

Test Configuration:

Checklist

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• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have made pertinent documentation changes
• My changes do not introduce new warnings