feat: add xtls-rprx-vision-udp443 flow support

[KlimSemikin]

Introduced support for xtls-rprx-vision-udp443 flow across backend and frontend

Since this flow is client-specific and not supported by Xray inbound configuration, it is replaced with xtls-rprx-vision when generating node configs

Summary by CodeRabbit

Release Notes

• New Features
  • Added 'xtls-rprx-vision-udp443' as a new VLESS flow option for proxy configuration. Users can now select this new flow type when creating or modifying proxies and user templates. The option is fully integrated across all proxy configuration interfaces and provides seamless compatibility with existing proxy settings.

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Walkthrough

A new VLESS flow option xtls-rprx-vision-udp443 is introduced across backend and frontend. The backend adds the enum value, normalizes it to xtls-rprx-vision during proxy creation, and the frontend updates validation schemas and UI dropdowns to support user selection of this flow.

Changes

Cohort / File(s)	Summary
Backend Enum & Flow Normalization app/models/proxy.py, app/node/user.py	Added VISION_UDP enum value to XTLSFlows and implemented normalization logic that converts the UDP flow to standard vision flow during proxy creation.
Frontend Type Definitions dashboard/src/service/api/index.ts	Extended the XTLSFlows exported constant and type union to include the new 'xtls-rprx-vision-udp443' flow value.
Frontend Form Validation Schemas dashboard/src/components/forms/user-form.ts, dashboard/src/components/forms/user-template-form.ts	Updated Zod enum validators to accept the new flow option alongside existing values.
Frontend UI Components dashboard/src/components/dialogs/user-modal.tsx, dashboard/src/components/dialogs/user-template-modal.tsx	Added new SelectItem options in flow dropdown menus and expanded TypeScript type annotations to include the new flow value.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A new flow springs forth, called vision-udp,
Through schemas and forms it finds its way up,
From backend to dashboard, the changes align,
Normalized, validated, simply divine! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add xtls-rprx-vision-udp443 flow support' directly and clearly summarizes the main change: adding support for a new XTLS flow type across the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ImMohammad20000]

Change target branch to dev