updating to match everything in my homelab.

diagrams/ntfy-discord-bridge.mmd

@@ -0,0 +1,45 @@
+```plaintext
+%% ntfy-Discord Bridge (ADR-0022)
+%% Sequence diagram showing message flow and transformation
+
+sequenceDiagram
+    autonumber
+    participant S as Notification Source<br/>(CI/Alertmanager)
+    participant N as ntfy<br/>Notification Hub
+    participant B as ntfy-discord<br/>Go Bridge
+    participant D as Discord<br/>Webhook
+
+    Note over S,N: Events published to ntfy topics
+
+    S->>N: POST /gitea-ci<br/>{title, message, priority}
+
+    Note over N,B: SSE subscription for real-time
+
+    N-->>B: SSE JSON stream<br/>{topic, message, priority, tags}
+
+    Note over B: Message transformation
+
+    rect rgb(240, 240, 240)
+        B->>B: Map priority to embed color<br/>urgent=red, high=orange<br/>default=blue, low=gray
+        B->>B: Format as Discord embed<br/>{embeds: [{title, description, color}]}
+    end
+
+    B->>D: POST webhook URL<br/>Discord embed format
+
+    Note over B: Hot-reload support
+
+    rect rgb(230, 245, 230)
+        B->>B: fsnotify watches secrets
+        B->>B: Reload config without restart
+    end
+
+    Note over B,D: Retry with exponential backoff
+
+    alt Webhook fails
+        B-->>B: Retry (2s, 4s, 8s...)
+        B->>D: Retry POST
+    end
+
+    D-->>D: Display in channel
+
+```