build: bump version to 6.1.0

SQLite wallet (default), RocksDB chaindb (default), Boost removal
from common link, I2P startup performance fix (180s→27ms).

Migration is automatic and non-destructive:
- Wallet: BDB → SQLite on first open (original preserved as .bdb.bak)
- ChainDB: LevelDB → RocksDB on next start (via -chaindb flag)

snap/snapcraft.yaml

@@ -1,6 +1,6 @@
 name: triangles
 base: core22
-version: '5.9.24'
+version: '6.1.0'
 summary: Cryptographic Triangles (TRI) cryptocurrency wallet
 description: |
   Privacy-focused cryptocurrency featuring Proof-of-Stake consensus,
@@ -51,10 +51,10 @@ apps:
 parts:
   triangles:
     plugin: dump
-    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v5.9.24/Cryptographic-Triangles-v5.9.24-linux-x64-qt
+    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.1.0/Cryptographic-Triangles-v6.1.0-linux-x64-qt
     source-type: file
     organize:
-      Cryptographic-Triangles-v5.9.24-linux-x64-qt: bin/triangles-qt
+      Cryptographic-Triangles-v6.1.0-linux-x64-qt: bin/triangles-qt
     stage-packages:
       - libqt5widgets5
       - libqt5gui5
@@ -73,10 +73,10 @@ parts:
 
   trianglesd:
     plugin: dump
-    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v5.9.24/Cryptographic-Triangles-v5.9.24-linux-x64-daemon
+    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.1.0/Cryptographic-Triangles-v6.1.0-linux-x64-daemon
     source-type: file
     organize:
-      Cryptographic-Triangles-v5.9.24-linux-x64-daemon: bin/trianglesd
+      Cryptographic-Triangles-v6.1.0-linux-x64-daemon: bin/trianglesd
 
   desktop-entry:
     plugin: dump