Add complete playout service, chat backend, frontend with HLS player and live chat, Docker integration with health checks, updated CHANGELOG and architecture docs

docs/architecture/adr/ADR-004-admin-video.md

@@ -1,9 +1,9 @@
 # ADR-004: Video Admin Web Interface (Upload, Playlist Management, Schedule Overrides)
 
-**Status:** Proposed  
+**Status:** Accepted  
 **Date:** 2026-08-02  
-**Author:** AI Assistant (following AGENTS.md and ADR-002/ADR-003)  
-**Related ADRs:** [ADR-001](./ADR-001.md), [ADR-002](./ADR-002-module-structure.md), [ADR-003](./ADR-003-tech-stack.md)
+**Author:** AI Assistant (following AGENTS.md, ADR-002, ADR-003, ADR-006, ADR-007)  
+**Related ADRs:** [ADR-001](./ADR-001.md), [ADR-002](./ADR-002-module-structure.md), [ADR-003](./ADR-003-tech-stack.md), [ADR-005](./ADR-005-admin-moderation-analytics.md), [ADR-006](./ADR-006-data-storage.md), [ADR-007](./ADR-007-redis-usage.md)
 
 ## Context
 
@@ -39,16 +39,18 @@ Create a dedicated **admin web interface** in a new `frontend/admin/` directory
 
 **UI Layout**:
 
-- Sidebar navigation (Dashboard, Upload, Playlist, Schedule, Logs).
-- Upload page with progress bar, normalization report, and "Add to Playlist" button.
-- Playlist page with reorderable list, preview thumbnails, and "Apply to Live" button.
-- Live status dashboard showing current segment, next video, and playout health.
-- Schedule override form for inserting emergency content.
+- Sidebar navigation (Dashboard, Upload, Playlist, Schedule, Moderation (ADR-005), System (Redis/storage config from ADR-007), Logs).
+- Upload page with progress bar, normalization report (ffprobe), and "Add to Playlist" button.
+- Playlist page with drag-and-drop editor, preview thumbnails, and "Apply to Live" button.
+- Schedule override form for inserting emergency content and metadata.
+- Live status dashboard showing current segment, next video, playout health, and R2 usage.
+- **System Configuration** tab (from ADR-007): View Redis stats (memory, clients, keys), adjust rate limits, TTLs, presence expiry, and storage settings (ADR-006). All changes audited to ModerationLog.
 
 **Folder Placement** (per ADR-002):
 
-- `frontend/admin/` – Admin-specific HTML/JS components.
-- `backend/playout/internal/admin/` – API handlers (or new `backend/admin/` service if complexity grows).
+- `frontend/admin/` – Admin-specific HTML/JS components (HTMX + Tailwind).
+- `backend/admin/` – Dedicated API handlers for validation, playlist updates, and configuration (or extend playout/chat services).
+- Protected route in nginx with authentication (JWT or Cloudflare Access).
 - Documentation and API specs added to `docs/architecture/`.
 
 ## Rationale