fix(i2p): populate .b32.i2p address — was never set, status bar always empty

i2pHostname was cleared on Start() but never populated, so
GetI2PAddress() always returned empty and the Qt status bar never
showed the I2P address even when the router was running.

Now queries i2p::context.GetRouterInfo().GetIdentHash().ToBase32()
after the bootstrap loop completes (both early-success and timeout
paths). The address appears as <hash>.b32.i2p in the status bar.

src/i2p/i2p_embedded.cpp

@@ -569,7 +569,7 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
             if (socksReady && samReady) {
                 printf("Embedded I2P: all I2P endpoints ready (SOCKS %d + SAM %d)\n",
                        socksPort, samPort);
-                return true;
+                break;
             }
 
             if (i > 0 && i % 30 == 0) {
@@ -579,12 +579,16 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
             }
         }
 
-        // Not everything ready after 120s — I2P may still be building tunnels.
-        // We return true anyway; connections will retry once tunnels are up.
-        printf("Embedded I2P: bootstrap incomplete after 120s"
-               " (SOCKS:%s SAM:%s) — will retry on demand.\n",
-               socksReady ? "ready" : "pending",
-               samReady ? "ready" : "pending");
+        // Populate the .b32.i2p address from the router's identity hash.
+        // This is the I2P address that appears in the Qt status bar.
+        try {
+            auto identHash = i2p::context.GetRouterInfo().GetIdentHash();
+            i2pHostname = identHash.ToBase32() + ".b32.i2p";
+            printf("Embedded I2P: router address = %s\n", i2pHostname.c_str());
+        } catch (...) {
+            printf("Embedded I2P: could not retrieve router address yet\n");
+        }
+
         return true;
 
     } catch (const std::exception& e) {