improve registration and add oauth

Gemfile.lock

@@ -232,6 +232,7 @@ GEM
       os (>= 0.9, < 2.0)
       signet (>= 0.16, < 2.a)
     hashdiff (1.0.1)
+    hashie (5.0.0)
     hexapdf (0.32.2)
       cmdparse (~> 3.0, >= 3.0.3)
       geom2d (~> 0.3)
@@ -282,6 +283,7 @@ GEM
     minitest (5.18.1)
     msgpack (1.7.1)
     multi_json (1.15.0)
+    multi_xml (0.6.0)
     multipart-post (2.3.0)
     mysql2 (0.5.5)
     net-http-persistent (4.0.2)
@@ -298,7 +300,29 @@ GEM
     nio4r (2.5.9)
     nokogiri (1.15.2-arm64-darwin)
       racc (~> 1.4)
+    oauth2 (2.0.9)
+      faraday (>= 0.17.3, < 3.0)
+      jwt (>= 1.0, < 3.0)
+      multi_xml (~> 0.5)
+      rack (>= 1.2, < 4)
+      snaky_hash (~> 2.0)
+      version_gem (~> 1.1)
     oj (3.15.0)
+    omniauth (2.1.1)
+      hashie (>= 3.4.6)
+      rack (>= 2.2.3)
+      rack-protection
+    omniauth-google-oauth2 (1.1.1)
+      jwt (>= 2.0)
+      oauth2 (~> 2.0.6)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.8.0)
+    omniauth-oauth2 (1.8.0)
+      oauth2 (>= 1.4, < 3)
+      omniauth (~> 2.0)
+    omniauth-rails_csrf_protection (1.0.1)
+      actionpack (>= 4.2)
+      omniauth (~> 2.0)
     openssl (3.1.0)
     orm_adapter (0.5.0)
     os (1.1.4)
@@ -326,6 +350,8 @@ GEM
       nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.7)
+    rack-protection (3.0.6)
+      rack
     rack-proxy (0.7.6)
       rack
     rack-test (2.1.0)
@@ -444,6 +470,9 @@ GEM
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
+    snaky_hash (2.0.1)
+      hashie
+      version_gem (~> 1.1, >= 1.1.1)
     sqlite3 (1.5.4)
       mini_portile2 (~> 2.8.0)
     strip_attributes (1.13.0)
@@ -462,6 +491,7 @@ GEM
     uber (0.1.0)
     unicode-display_width (2.4.2)
     uniform_notifier (1.16.0)
+    version_gem (1.1.3)
     warden (1.2.9)
       rack (>= 2.0.9)
     web-console (4.2.0)
@@ -507,6 +537,8 @@ DEPENDENCIES
   lograge
   mysql2
   oj
+  omniauth-google-oauth2
+  omniauth-rails_csrf_protection
   pagy
   pg
   premailer-rails