feat: add Astraflow provider support

[ucloudnb666]

What does this PR do?

Adds Astraflow (by UCloud / 优刻得) as a new agent provider — an OpenAI-compatible AI model aggregation platform supporting 200+ models.

Since Astraflow exposes an OpenAI-compatible API, this integration reuses the existing opencode CLI backend and injects the appropriate OPENAI_BASE_URL + OPENAI_API_KEY env vars at task-execution time. No new SDK or subprocess is required.

Two variants are supported:

Provider key	Endpoint	Env var
astraflow	https://api-us-ca.umodelverse.ai/v1	ASTRAFLOW_API_KEY
astraflow-cn	https://api.modelverse.cn/v1	ASTRAFLOW_CN_API_KEY

• Global: sign up at https://astraflow.ucloud-global.com
• China: sign up at https://astraflow.ucloud.cn

Related Issue

Closes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Refactor / code improvement (no behavior change)
• Documentation update
• Tests (adding or improving test coverage)
• CI / infrastructure

Changes Made

• .env.example — Documents ASTRAFLOW_API_KEY and ASTRAFLOW_CN_API_KEY
• server/internal/daemon/config.go — Probes opencode binary when an Astraflow API key env var is set; registers astraflow / astraflow-cn agent entries
• server/pkg/agent/agent.go — Adds astraflow and astraflow-cn cases to the New() factory; each injects OPENAI_BASE_URL + OPENAI_API_KEY into the opencodeBackend config; updates launchHeaders
• server/pkg/agent/models.go — Adds astraflow / astraflow-cn cases to ListModels(), delegating to discoverOpenCodeModels
• packages/views/runtimes/components/provider-logo.tsx — Adds AstraflowLogo SVG (UCloud blue #0052D9) and the astraflow / astraflow-cn switch cases

How to Test

1. Set the API key env var:

   # Global endpoint
   export ASTRAFLOW_API_KEY=your-key-here
   
   # China endpoint (optional)
   export ASTRAFLOW_CN_API_KEY=your-cn-key-here

2. Start the daemon as usual.
3. Verify that astraflow (and/or astraflow-cn) appears as an auto-detected runtime alongside other configured providers, and that model listing and task execution work correctly against the Astraflow endpoint.

Checklist

• I have included a thinking path that traces from project context to this change
• I have run tests locally and they pass
• I have added or updated tests where applicable
• If this change affects the UI, I have included before/after screenshots
• I have updated relevant documentation to reflect my changes
• If I added a new runtime / coding tool / UI tab, I synced the change to landing copy (apps/web/features/landing/i18n/) and relevant docs (apps/docs/content/docs/)
• If this PR touches Chinese product copy, I checked it against apps/docs/content/docs/developers/conventions.zh.mdx (terminology, mixed-rule for task / issue / skill)
• I have considered and documented any risks above
• I will address all reviewer comments before requesting merge

AI Disclosure

AI tool used:

Prompt / approach:

Screenshots (optional)

N/A

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