docs: add AetherAPI provider design

Author: Aculnaj

docs/superpowers/specs/2026-05-15-aetherapi-provider-design.md

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+# AetherAPI Provider Integration
+
+## Summary
+
+Add AetherAPI (`https://api.aetherapi.dev/v1`) as a new OpenAI-compatible LLM provider in zoo-code.
+
+## Model
+
+- **ID**: `kimi-k2.6`
+- **Context Window**: 262,144 tokens
+- **Supports Images**: yes
+- **Supports Tool Calls**: yes
+- **Input Price**: $0.42 / 1M tokens
+- **Output Price**: $1.96 / 1M tokens
+
+## Architecture
+
+Follow the existing `BaseOpenAiCompatibleProvider` pattern used by Fireworks, Together, etc.
+
+### Files to Create
+
+1. `packages/types/src/providers/aetherapi.ts` — model metadata
+2. `src/api/providers/aetherapi.ts` — API handler
+3. `webview-ui/src/components/settings/providers/Aetherapi.tsx` — settings UI
+
+### Files to Modify
+
+1. `packages/types/src/provider-settings.ts` — add `aetherapi` to enums, schemas, mappings
+2. `packages/types/src/providers/index.ts` — export model metadata
+3. `src/api/providers/index.ts` — export handler
+4. `src/api/index.ts` — factory case
+5. `webview-ui/src/components/settings/constants.ts` — provider list + models
+6. `webview-ui/src/components/settings/utils/providerModelConfig.ts` — service config + default model
+7. `webview-ui/src/components/settings/ApiOptions.tsx` — wire UI component
+8. `webview-ui/src/components/settings/providers/index.ts` — export component
+9. `webview-ui/src/i18n/locales/en/settings.json` — translation keys
+
+## Settings
+
+- `aetherapiApiKey` (optional, string)
+- `aetherapiBaseUrl` (optional, string, default: `https://api.aetherapi.dev/v1`)
+
+## Error Handling
+
+Inherited from `BaseOpenAiCompatibleProvider` via `handleOpenAIError`.