Implement OAuth login functionality and enhance documentation

- Added support for Google OAuth login, including new API endpoints for OAuth providers and callbacks.
- Updated user authentication logic to handle OAuth-only users.
- Enhanced README.md and deployment documentation with OAuth setup instructions.
- Modified frontend components to include OAuth login options and improved error handling.
- Updated configuration files to include new environment variables for OAuth integration.

go.mod

@@ -1,10 +1,18 @@
-module github.com/andyleap/hnh-map
-
-go 1.21
-
-require (
-	go.etcd.io/bbolt v1.3.3
-	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
-	golang.org/x/image v0.0.0-20200119044424-58c23975cae1
-	golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 // indirect
-)
+module github.com/andyleap/hnh-map
+
+go 1.21
+
+require (
+	go.etcd.io/bbolt v1.3.3
+	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
+	golang.org/x/image v0.0.0-20200119044424-58c23975cae1
+	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
+)
+
+require (
+	cloud.google.com/go v0.34.0 // indirect
+	github.com/golang/protobuf v1.2.0 // indirect
+	golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 // indirect
+	golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 // indirect
+	google.golang.org/appengine v1.4.0 // indirect
+)