Remove unused yaak-proxy-models crate

Replaced by a purpose-built ProxyEntry model to be added to
yaak-proxy-lib, which better handles multi-protocol capture
(HTTP, gRPC, GraphQL, WebSocket) without REST-specific assumptions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Cargo.lock

@@ -10602,23 +10602,6 @@ dependencies = [
  "yaak-rpc",
 ]
 
-[[package]]
-name = "yaak-proxy-models"
-version = "0.1.0"
-dependencies = [
- "chrono",
- "include_dir",
- "log 0.4.29",
- "r2d2",
- "r2d2_sqlite",
- "rusqlite",
- "sea-query",
- "serde",
- "serde_json",
- "thiserror 2.0.17",
- "yaak-database",
-]
-
 [[package]]
 name = "yaak-rpc"
 version = "0.0.0"