feat: add MiniMax CLI provider with Anthropic-compatible runtime

[octo-patch]

Reason: Add the MiniMax provider to the CLI registry with Anthropic-compatible runtime support for the configured global_en and cn_zh endpoints.

Adds a new MiniMax CLI provider and its two current models (MiniMax-M3 and MiniMax-M2.7), wired through the existing Claude Agent SDK runtime.

Changes:

• lib/constants/minimaxModels.ts: new model registry with MiniMax-M3 (1M context, multimodal input) and MiniMax-M2.7 (204k context, text only), plus alias normalization and display-name helpers.
• lib/services/cli/minimax.ts: new CLI service modeled on the GLM runtime. It drives the Claude Agent SDK query loop, points ANTHROPIC_BASE_URL at the Anthropic-compatible MiniMax endpoint, and switches between the global (api.minimax.io) and China (api.minimaxi.com) regional endpoints via MINIMAX_REGION (default global_en).
• lib/constants/cliModels.ts: register minimax in the CLI key type, default model map, model definition map, and normalize/display-name dispatch.
• types/cli.ts / types/backend/cli.ts: extend CLIType and add a MiniMax option to CLI_OPTIONS.
• lib/utils/cliOptions.ts: add minimax to ACTIVE_CLI_IDS.
• app/api/chat/[project_id]/act/route.ts: dispatch minimax to the new initializer/apply executors.
• app/api/settings/cli-status/route.ts: report MiniMax CLI/model status (reuses the Claude Code runtime check).
• lib/services/settings.ts / contexts/GlobalSettingsContext.tsx: default MiniMax settings entry.
• components/settings/GlobalSettings.tsx: MiniMax CLI card with API key field, install/auth/test commands, and branding.
• components/modals/CreateProjectModal.tsx: MiniMax option in the new-project CLI picker.

Configuration:

• Set a MiniMax API key in Settings → AI Agents → MiniMax CLI (stored as MINIMAX_API_KEY and injected as ANTHROPIC_AUTH_TOKEN/ANTHROPIC_API_KEY at runtime).
• Set MINIMAX_REGION=cn_zh to target the China Anthropic-compatible endpoint (api.minimaxi.com); default is global_en (api.minimax.io).

Checks run:

• npx tsc --noEmit (type-check): passed.
• npx next lint: passed with no warnings or errors.

[octo-patch]

I added the missing MiniMax provider icon so the new CLI entries no longer reference an absent asset. I ran git diff --check and verified the configured icon path resolves; dependency installation could not run because the worker filesystem is full.