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

internal/repository/models.go

@@ -0,0 +1,18 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package repository
+
+type Session struct {
+	UUID        string
+	Username    string
+	Email       string
+	Name        string
+	Provider    string
+	TotpPending bool
+	OAuthGroups string
+	Expiry      int64
+	OAuthName   string
+	OAuthSub    string
+}