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Add an AI client module that integrates with OpenAI-compatible API providers (OpenAI, Perplexity, and custom providers) to provide AI-assisted responses within the profanity client. The implementation includes: - src/ai/ai_client.c/h: Core AI client with provider management, session handling, and async HTTP request handling via libcurl. Supports per-provider API keys stored in preferences, reference- counted sessions, and conversation history tracking. - src/ui/window.c/window_list.c: New AI window type (ProfAiWin) for displaying AI conversations, with response streaming and error display capabilities. - Command integration: New `/ai` command (cmd_defs.c, cmd_funcs.c) for creating sessions, sending prompts, and managing providers. Provider autocomplete support in cmd_ac.c. - Preferences integration: API keys for providers are persisted in the preferences system (config/preferences.c). - Unit tests: 472 lines of comprehensive tests covering provider management, session lifecycle, JSON escaping, and autocomplete (tests/unittests/test_ai_client.c). Architecture decisions: - Asynchronous design: HTTP requests run on a separate thread to avoid blocking the main UI loop. Callbacks are invoked on the main thread via direct function call (profanity uses ncurses, not GLib main loop). - Reference counting: Both AIProvider and AISession use ref counting for safe shared ownership. - Response size limit: 10MB cap on HTTP responses to prevent OOM.