docs: rewrite all hookshot transformation functions, purge Huntarr

- Remove all Huntarr references (webhook removed for security reasons)
- Rewrite transformation functions for all 11 active webhooks via Matrix
  state event API — all now handle the full event payload:
  - Sonarr/Radarr/Readarr/Lidarr: all event types (Grab, Download, Rename,
    Add, Delete, HealthIssue, HealthRestored, ApplicationUpdate) with release
    group, download client, upgrade indicator
  - Grafana: multi-alert support with per-alert severity/instance/summary,
    generator URLs, truncation notice for >5 alerts
  - Proxmox: VM/CT name+ID, task type/status, property bag fields
  - Uptime Kuma: ping time on UP, downtime duration on DOWN, URL linkified
  - Seerr: all notification types, 4K flag, issue type, comment field
  - Owncast: all event types (STREAM_STARTED/STOPPED, USER_JOINED, CHAT)
  - Bazarr: multi-line message support from Apprise JSON payload
  - Tinker-Tickets: preserved as-is (already comprehensive)
- Huntarr state event cleared in room, UUID removed from account_data map
- Owncast and Uptime Kuma functions restored (had lost their functions)
- Hookshot restarted to pick up all changes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -131,7 +131,6 @@ Webhook URL format: `https://matrix.lotusguild.org/webhook/<uuid>`
 | Seerr | `555185af-90a1-42ff-aed5-c344e11955cf` | Request/approval events |
 | Owncast | `9993e911-c68b-4271-a178-c2d65ca88499` | STREAM_STARTED / STREAM_STOPPED |
 | Bazarr | `470fb267-3436-4dd3-a70c-e6e8db1721be` | Subtitle events (Apprise JSON notifier) |
-| ~~Huntarr~~ | ~~`78af735b-7802-4e6c-987b-db22f8636ceb`~~ | **REMOVED — security concern** |
 | Tinker-Tickets | `6e306faf-8eea-4ba5-83ef-bf8f421f929e` | Custom transformation code |
 
 **Hookshot notes:**
@@ -430,11 +429,11 @@ cp -r dist/* /var/www/html/
 
 ### Webhooks & Integrations
 - [x] matrix-hookshot 7.3.2 installed and running
-- [x] Generic webhook bridge for 11 active services
-- [x] Per-service JS transformation functions (formatted messages with emoji)
+- [x] Generic webhook bridge for 11 active services (Grafana, Proxmox, Sonarr, Radarr, Readarr, Lidarr, Uptime Kuma, Seerr, Owncast, Bazarr, Tinker-Tickets)
+- [x] Per-service JS transformation functions — all rewritten to handle full event payloads (all event types, health alerts, app updates, release groups, download clients)
 - [x] Per-service virtual user avatars
 - [x] NPM reverse proxy for `/webhook` path
-- [x] Tinker Tickets custom code
+- [x] Tinker Tickets custom transformation code
 
 ### Room Structure
 - [x] The Lotus Guild space