chore: rewrite the backend (not tested) (#203)

* wip: refactor

* refactor

* clean up

* .

* rename

* add relay auth

* .

* .

* optimize

* .

* clean up

* add encryption crate

* .

* .

* .

* .

* .

* add encryption crate

* .

* refactor nip4e

* .

* fix endless loop

* fix metadata fetching

crates/common/src/constants.rs

@@ -0,0 +1,35 @@
+pub const CLIENT_NAME: &str = "Coop";
+pub const APP_ID: &str = "su.reya.coop";
+
+/// Bootstrap Relays.
+pub const BOOTSTRAP_RELAYS: [&str; 5] = [
+    "wss://relay.damus.io",
+    "wss://relay.primal.net",
+    "wss://relay.nos.social",
+    "wss://user.kindpag.es",
+    "wss://purplepag.es",
+];
+
+/// Search Relays.
+pub const SEARCH_RELAYS: [&str; 1] = ["wss://relay.nostr.band"];
+
+/// Default relay for Nostr Connect
+pub const NOSTR_CONNECT_RELAY: &str = "wss://relay.nsec.app";
+
+/// Default retry count for fetching NIP-17 relays
+pub const RELAY_RETRY: u64 = 2;
+
+/// Default retry count for sending messages
+pub const SEND_RETRY: u64 = 10;
+
+/// Default timeout (in seconds) for Nostr Connect
+pub const NOSTR_CONNECT_TIMEOUT: u64 = 200;
+
+/// Default timeout (in seconds) for Nostr Connect (Bunker)
+pub const BUNKER_TIMEOUT: u64 = 30;
+
+/// Total metadata requests will be grouped.
+pub const METADATA_BATCH_LIMIT: usize = 20;
+
+/// Default width of the sidebar.
+pub const DEFAULT_SIDEBAR_WIDTH: f32 = 240.;