feat: compress connection keys (rtun2) for easier copy/paste

droid-wiki/reference/data-models.md

@@ -4,7 +4,7 @@
 
 ```rust
 pub struct ConnectionKey {
-    pub version: u8,          // must be 1
+    pub version: u8,          // must be 2
     pub target: String,       // listener address
     pub ca_cert_pem: String,
     pub server_cert_pem: String,
@@ -15,7 +15,7 @@ pub struct ConnectionKey {
 }
 ```
 
-Encoded as: `rtun1.` + base64url(JSON) — no padding.
+Encoded as: `rtun2.` + base64url(deflate(JSON)) — no padding.
 
 ## Config
 

droid-wiki/reference/dependencies.md

@@ -27,6 +27,7 @@
 | `http-body-util` | 0.1 | HTTP body utilities |
 | `tower-service` | 0.3 | Service trait (Hyper ecosystem) |
 | `base64` | 0.22 | Connection key encoding |
+| `miniz_oxide` | 0.8 | DEFLATE compression for connection keys |
 | `sha2` | 0.10 | Certificate fingerprinting |
 | `bytes` | 1 | Byte buffers for framing |
 | `futures` | 0.3 | Future utilities |