Added Fienta integration

docs/LAN_FIENTA_SETUP.md

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+# LAN Fienta Setup
+
+This profile runs the same codebase as a separate Discord bot process:
+
+```powershell
+$env:BOT_PROFILE="lan"
+python bot.py
+```
+
+## Environment
+
+Required `.env` values:
+
+```env
+BOT_PROFILE=lan
+DISCORD_BOT_LAN=...
+GUILD_ID_LAN=1301145356750426192
+SHEET_ID_LAN=1cYEI2EmQDMZdVOarbOkVw7IHsnfqtYbWhA-6zC_r-zw
+PB_ECONOMY_COLLECTION_LAN=economy_users_lan
+PB_FIENTA_COLLECTION_LAN=fienta_registrations_lan
+FIENTA_WEBHOOK_SECRET=<optional-long-random-secret>
+FIENTA_WEBHOOK_PORT=8090
+FIENTA_ADMIN_ALERT_CHANNEL_ID=1478302279894302812
+```
+
+The LAN bot must be invited to the LAN server and to the dev server that owns
+the alert channel.
+
+## Fienta Webhooks
+
+Use these URLs in Fienta:
+
+```text
+Ostu sooritamisel:
+https://veebikonks.tipilan.ee/fienta/purchase
+
+Registreerimisvormi täitmisel peale ostu:
+https://veebikonks.tipilan.ee/fienta/registration
+```
+
+Leave `Pileti valideerimisel` empty for now.
+
+The old secret-token endpoint is still supported for testing:
+
+```text
+https://veebikonks.tipilan.ee/fienta/webhook/<FIENTA_WEBHOOK_SECRET>
+```
+
+## Caddy
+
+If Caddy is on the same Docker network as the bot service:
+
+```caddyfile
+veebikonks.tipilan.ee {
+    reverse_proxy /fienta/* bot:8090
+}
+```
+
+If Caddy runs on the host, make sure `localhost:8090` points to the bot webhook,
+not PocketBase. The current compose file publishes PocketBase on host port
+`8090`, so host-level Caddy cannot also proxy that same host port to the bot
+unless PocketBase is moved or the bot is exposed through a different host route.
+
+## Ticket Mapping
+
+- `595507` - CS2 participant, public sheet row, CS2/team/language roles
+- `595509` - CS2 reserve, roles only
+- `595510` - CS2 manager, CS2/team/language/Manager roles
+- `595912` - LoL participant, public sheet row, LoL/team/language roles
+
+Public sheet rows:
+
+- `CS2`: rows `6` through `37`
+- `LoL`: rows `6` through `17`
+
+## Admin Command
+
+Use `/fientasync` in the LAN server to re-apply stored Fienta registrations to
+Discord roles and the public sheet.