login-credentials without RBAC (#173)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: https://dev.hostsharing.net/hostsharing/hs.hsadmin.ng/pulls/173
Reviewed-by: Marc Sandlus <marc.sandlus@hostsharing.net>

doc/ideas/login-credentials-data-model.mermaid

@@ -0,0 +1,49 @@
+classDiagram
+    direction LR
+
+    OfficePerson o.. "*" LoginCredentials
+    LoginCredentials "1" o-- "1" RbacSubject
+
+    LoginContext "1..n" --o "1" LoginContextMapping
+    LoginCredentials "1..n" --o "1" LoginContextMapping
+
+    class LoginCredentials{
+        +twoFactorAuth: text
+        +telephonePassword: text
+        +emailAdress: text
+        +smsNumber: text
+        -active: bool [r/w]
+        -globalUid: int [w/o]
+        -globalGid: int [w/o]
+        -onboardingToken: text [w/o]
+    }
+
+    class LoginContext{
+        -type: Enum [SSH, Matrix, Mastodon, ...]
+        -qualifier: text
+    }
+
+    class LoginContextMapping{
+    }
+    note for LoginContextMapping "Assigns LoginCredentials to LoginContexts"
+
+    class RbacSubject{
+        +uuid: uuid
+        +name: text # == nickname
+    }
+
+    class OfficePerson{
+        +type: enum
+        +tradename: text
+        +title: text
+        +familyName: text
+        +givenName: text
+        +salutation: text
+    }
+
+    style LoginContext fill:#00f,color:#fff
+    style LoginContextMapping fill:#00f,color:#fff
+    style LoginCredentials fill:#00f,color:#fff
+
+    style RbacSubject fill:#f96,color:#fff
+    style OfficePerson fill:#f66,color:#000