lint: enable deprecation checks

Enable staticcheck's SA1019 check in golangci-lint so deprecated
identifiers are caught in CI.

Replace deprecated standard library and bbolt APIs with their current
equivalents. Keep intentional compatibility reads and writes of
deprecated Loop RPC fields behind narrow nolint annotations, because
older clients and persisted liquidity parameters still depend on those
fields.

.golangci.yml

@@ -55,14 +55,16 @@ linters:
     - wsl_v5
     - noinlineerr
   settings:
+    staticcheck:
+      checks:
+        - all
+        - -QF*
+        - -ST*
     gosec:
       excludes:
         - G402
         - G306
         - G115
-    staticcheck:
-      checks:
-        - -SA1019
     tagliatelle:
       case:
         rules: