feat: connectivity view: quota for all transports (#7630)

- **show quota of all relays**
- **remove `DC_STR_STORAGE_ON_DOMAIN` stock string**
- renames the quota section to "Relay Capacity" until we come up with a
better name in
https://github.com/chatmail/core/issues/7580#issuecomment-3633803432

closes #7591

<img width="300" alt="image"
src="https://github.com/user-attachments/assets/1909dccd-e6b3-42e6-963f-004b2b464db7"
/> <img width="300" alt="image"
src="https://github.com/user-attachments/assets/1e97e67b-e0ed-492b-95a0-6ef12595abe4"
/>

src/config.rs

@@ -944,7 +944,7 @@ impl Context {
     /// This should only be used by test code and during configure.
     #[cfg(test)] // AEAP is disabled, but there are still tests for it
     pub(crate) async fn set_primary_self_addr(&self, primary_new: &str) -> Result<()> {
-        self.quota.write().await.take();
+        self.quota.write().await.clear();
 
         self.sql
             .set_raw_config(Config::ConfiguredAddr.as_ref(), Some(primary_new))