Improve dashboard display and fix service issues

- Remove unreachable descriptions from failed nginx sites
- Show complete site URLs instead of truncating at first dot
- Implement service-specific disk quotas (docker: 4GB, immich: 4GB, others: 1-2GB)
- Truncate process names to show only executable name without full path
- Display only highest C-state instead of all C-states for cleaner output
- Format system RAM as xxxMB/GB (totalGB) to match services format

CLAUDE.md

@@ -332,11 +332,30 @@ rm /tmp/cm-maintenance
 4. Dashboard uses `status_level_from_agent_status()` for display
 5. Agent adds notification monitoring for status changes
 
+**Testing & Building:**
+- ALWAYS use `cargo build --workspace` to match NixOS build configuration
+- Test with OpenSSL environment variables when building locally:
+  ```bash
+  OPENSSL_DIR=/nix/store/.../openssl-dev \
+  OPENSSL_LIB_DIR=/nix/store/.../openssl/lib \
+  OPENSSL_INCLUDE_DIR=/nix/store/.../openssl-dev/include \
+  PKG_CONFIG_PATH=/nix/store/.../openssl-dev/lib/pkgconfig \
+  OPENSSL_NO_VENDOR=1 cargo build --workspace
+  ```
+- This prevents build failures that only appear in NixOS deployment
+
+**Notification System:**
+- Universal automatic detection of all `_status` fields across all collectors
+- Sends emails from `hostname@cmtec.se` to `cm@cmtec.se` for any status changes
+- Status stored in-memory: `HashMap<"component.metric", status>`
+- Recovery emails sent when status changes from warning/critical → ok
+
 **NEVER:**
 - Add hardcoded thresholds to dashboard widgets
 - Calculate status in dashboard with different thresholds than agent
 - Use "ok" as default when agent status is missing (use "unknown")
 - Calculate colors in widgets (TableBuilder's responsibility)
+- Use `cargo build` without `--workspace` for final testing
 
 # Important Communication Guidelines