feat: add Brainiall as a named API provider

[fasuizu-br]

Summary

• Adds Brainiall as a first-class API provider with 18 models served via AWS Bedrock
• OpenAI-compatible gateway at https://apim-ai-apis.azure-api.net/v1 with Bearer auth
• Follows the xAI pattern: hardcoded model list, OpenAI SDK, fixed baseURL
• Supports streaming, tool calls, reasoning content (DeepSeek R1 via preserveReasoning), reasoning budget (Claude Opus 4.5 via supportsReasoningBudget), and prompt caching (Claude models)

Models (18 total)

Model	Context	Cache	Reasoning	Vision	Input $/M	Output $/M
Claude Opus 4.6	200K	Yes	-	Yes	$5.00	$25.00
Claude Sonnet 4.6 (default)	200K	Yes	-	Yes	$3.00	$15.00
Claude Haiku 4.5	200K	Yes	-	Yes	$1.00	$5.00
Claude Opus 4.5	200K	Yes	Budget	Yes	$15.00	$75.00
DeepSeek R1	128K	-	Yes	-	$1.35	$5.40
DeepSeek V3.2	128K	-	-	-	$0.27	$1.10
Llama 3.3 70B	128K	-	-	-	$0.72	$0.72
Llama 4 Scout 17B	512K	-	-	-	$0.17	$0.17
Nova Pro	300K	-	-	Yes	$0.80	$3.20
Nova Lite	300K	-	-	Yes	$0.06	$0.24
Nova Micro	300K	-	-	-	$0.04	$0.14
Mistral Large 3 675B	128K	-	-	Yes	$2.00	$6.00
Devstral 2 123B	128K	-	-	-	$0.50	$1.50
Qwen3 80B	128K	-	-	-	$0.50	$0.50
Qwen3 32B	128K	-	-	-	$0.35	$0.35
MiniMax M2	1M	-	-	-	$1.00	$5.00
Kimi K2.5	128K	-	-	-	$0.60	$2.40
GPT OSS 120B	200K	-	-	-	$1.35	$5.40

Files changed (33 files)

New files (3):

• packages/types/src/providers/brainiall.ts — Model definitions
• src/api/providers/brainiall.ts — API handler (OpenAI SDK)
• webview-ui/src/components/settings/providers/Brainiall.tsx — Settings UI

Modified files (30):

• packages/types/: provider-settings, providers/index, global-settings (secret keys)
• src/api/: index (switch case), providers/index (export)
• src/shared/: ProfileValidator (model ID resolution)
• webview-ui/: ApiOptions, constants, providers/index, providerModelConfig, useSelectedModel, validate
• 18 locale files (ca, de, en, es, fr, hi, id, it, ja, ko, nl, pl, pt-BR, ru, tr, vi, zh-CN, zh-TW)

Test plan

• pnpm --filter @roo-code/types build passes (DTS + CJS + ESM)
• tsc --noEmit passes for all packages (types, roo-cline, vscode-webview, etc.)
• ESLint passes across all 14 packages with --max-warnings=0
• Prettier formatting passes
• All pre-commit and pre-push hooks pass
• Manual: Select Brainiall provider in settings, enter API key, verify model picker shows 18 models
• Manual: Send a message using Claude Sonnet 4.6, verify streaming response
• Manual: Test DeepSeek R1 reasoning content appears in thinking panel

Interactively review PR in Roo Code Cloud

[fasuizu-br]

Hi @hannesrudolph, thanks for taking the time to review. I noticed the PR was closed without feedback — could you share what needs to change for a provider addition to be accepted?

I see the project follows an Issue-First approach (CONTRIBUTING.md), and I didn't create a linked issue beforehand — that may have been the reason. I also noticed PR #11297 removed 9 low-usage providers, so I understand the team is being selective.

If adding Brainiall as a named provider is something the project would consider (it's an OpenAI-compatible gateway to 113+ models on AWS Bedrock with Flex/Cache pricing), I'm happy to:

1. Create a proper Enhancement Request issue first
2. Discuss on Discord before implementation
3. Adjust the implementation to match current patterns (AI SDK migration, etc.)

Any guidance would be appreciated!