feat: Addition of authentication and user management systems

app/api/v1/schemas/token.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel, Field, field_validator
+
+
+# ----------------------------------------------------------------------
+# Token
+# ----------------------------------------------------------------------
+class TokenRequest(BaseModel):
+    username: str = Field(..., min_length=3, max_length=30)
+    password: str
+
+    @field_validator("username")
+    def all_allowed_chars(cls, v):
+        for v_char in v:
+            if not v_char in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_":
+                raise ValueError("username can only contain a-z, A-Z, 0-9 and _")
+        return v
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"