refactor: replace gorm with vanilla sql and sqlc (#541)

* refactor: replace gorm with vanilla sql and sqlc

* chore: go mod tidy

* refactor: rebase for main

* tests: fix tests

* fix: review comments

sqlc.yml

@@ -0,0 +1,21 @@
+version: "2"
+sql:
+  - engine: "sqlite"
+    queries: "query.sql"
+    schema: "schema.sql"
+    gen:
+      go:
+        package: "repository"
+        out: "internal/repository"
+        rename:
+          uuid: "UUID"
+          oauth_groups: "OAuthGroups"
+          oauth_name: "OAuthName"
+          oauth_sub: "OAuthSub"
+        overrides:
+          - column: "sessions.oauth_groups"
+            go_type: "string"
+          - column: "sessions.oauth_name"
+            go_type: "string"
+          - column: "sessions.oauth_sub"
+            go_type: "string"