feat/dns

[0xJacky]

Note

Adds full DNS domain/record management with multi-provider support and DDNS (backend APIs, cron) plus new UI (domains, records, DDNS), i18n, and docs.

• Backend:
  • Introduces DNS domain/record management with provider abstraction (Cloudflare, AliDNS, Tencent Cloud) in internal/dns/*.
  • Adds DnsDomain and DDNSConfig models, CRUD APIs, and integrates routes in router/routers.go.
  • Implements DDNS scheduling and runtime updates via new cron jobs.
  • Updates dependencies for provider SDKs and related libraries.
• Frontend:
  • Adds DNS module routes and pages: domain list, record manager, DDNS manager, and moves DNS credential UI under dns/.
  • New components for DNS record form/filter/table; new Pinia dns store.
  • Broad i18n updates and docs note for DNS domain management.

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