Add AI travel day summaries via OpenRouter for skippers.

Skipper-only proxy with per-entry rate limiting, encrypted payload storage, CSV export, and Plausible tracking.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -1,5 +1,11 @@
 OpenWeatherMapAPIKey=<owm_api_key>
 
+# OpenRouter API (AI travel day summaries — server-side proxy)
+OpenRouterAPIKey=
+# Optional model override (default: anthropic/claude-3.5-haiku)
+# Valid examples: anthropic/claude-3.5-haiku, anthropic/claude-3-haiku, anthropic/claude-haiku-4.5
+# OpenRouterModel=anthropic/claude-3.5-haiku
+
 # DeepL API (for scripts/translate-locales.mjs and scripts/translate-flyer.mjs)
 # Free plan keys use api-free.deepl.com automatically (suffix :fx)
 DeepLAPIKey=