[GUI] createProvider sends duplicate camelCase and snake_case fields

[Vantalens]

File: packages/gui/src/daemon-client/client.ts:478

Severity: High

Description:
Sends providerType + provider_type, apiKey + api_key, apiBase + api_base; API may reject duplicate fields or use wrong one depending on parsing order, causing config corruption.

Code:

await client.createProvider({
  name: providerName,
  providerType,
  provider_type: providerType,
  apiKey,
  api_key: apiKey,
  apiBase,
  api_base: apiBase,
});

Failure Scenario:

• User adds new provider
• Payload contains both naming conventions for every field
• Rust daemon may:
  • Reject as invalid (duplicate field error)
  • Parse one and ignore the other (undefined precedence)
  • Store corrupted config mixing both conventions
• Provider creation fails or behaves inconsistently

Suggested Fix:
Align with daemon API contract, send only one naming convention per field.