Move template assets to .env-driven generation.

Site metadata, images, favicons, and YouTube settings are now configured via .env and rendered from HTML/manifest templates at dev or container startup.

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

.env.example

@@ -1,12 +1,29 @@
-# Slavic Pulse — Environment Configuration (Local Development)
+# Slavic Pulse — Environment Configuration
 # Copy to .env and fill in your values.
 # Never commit .env with real credentials to version control.
+#
+# Po zmianie wartości uruchom: ./dev.sh config  (lub ./dev.sh restart)
 
 # --- Frontend Server ---
 # Port na hoście (localhost). W kontenerze nginx zawsze nasłuchuje na 80.
-# Mapowanie w docker-compose.yml: ${FRONTEND_PORT}:80
 FRONTEND_PORT=8082
 
-# --- Po zakończeniu intro wideo ---
-# Adres docelowy przekierowania po zakończeniu odtwarzania filmu.
+# --- Strona (meta, SEO, PWA) ---
+SITE_TITLE="Slavic Pulse"
+SITE_SHORT_NAME="Slavic Pulse"
+SITE_BASE_URL=https://slavic-pulse.com
+SITE_DESCRIPTION="Lokalne modele LLM, własny serwer AI (Proxmox, TrueNAS, Ubuntu), RAG, Ollama, Open WebUI, bezpieczny self-hosting i wdrożenia biznesowe lokalnej AI."
+SITE_OG_IMAGE_ALT="Slavic Pulse"
+THEME_COLOR=#000000
+
+# --- Obrazy i ikony (ścieżki względem roota strony) ---
+BG_IMAGE=/assets/imgs/www-bg-slavic-pulse-com-001.jpg
+FAVICON_48=/assets/imgs/favico/48x48.png
+FAVICON_180=/assets/imgs/favico/180x180.png
+FAVICON_512=/assets/imgs/favico/512x512.png
+
+# --- YouTube ---
+# ID filmu intro (z adresu youtube.com/watch?v=...)
+VIDEO_ID=kujXXtoHUbc
+# Adres docelowy po zakończeniu odtwarzania intro
 POST_VIDEO_REDIRECT_URL=https://www.youtube.com/watch?v=kujXXtoHUbc