feat(settings): add SMTP admin configuration

backend/hermes/app/schemas/dashboard.py

@@ -13,12 +13,19 @@ class EmptyWidget(BaseModel):
     message: str
 
 
+class SystemStatusItem(BaseModel):
+    label: str
+    value: str
+    status: str = "info"
+
+
 class DashboardSummary(BaseModel):
     customers: list[MetricCard] = []
     latest_customers: list[CustomerResponse] = []
     users: list[MetricCard] = []
     roles: list[MetricCard] = []
     repairs: list[MetricCard] = []
+    system_status: list[SystemStatusItem] = []
     activities: EmptyWidget
     tasks: EmptyWidget
     tickets: EmptyWidget

backend/hermes/app/schemas/system_setting.py

@@ -0,0 +1,70 @@
+from typing import Literal
+
+from pydantic import BaseModel, EmailStr, Field, field_validator, model_validator
+
+
+SettingsSource = Literal["database", "environment", "missing"]
+
+
+def normalize_text(value: object) -> str:
+    if value is None:
+        return ""
+    return str(value).strip()
+
+
+class SmtpSettingsResponse(BaseModel):
+    host: str = ""
+    port: int = 587
+    username: str = ""
+    password_is_set: bool = False
+    from_email: str = ""
+    from_name: str = "Funktechnik Schubert"
+    use_tls: bool = True
+    enabled: bool = False
+    source: SettingsSource
+
+
+class SmtpSettingsUpdate(BaseModel):
+    host: str = Field(default="", max_length=255)
+    port: int = Field(default=587, ge=1, le=65535)
+    username: str = Field(default="", max_length=255)
+    password: str | None = Field(default=None, max_length=1000)
+    from_email: str = Field(default="", max_length=255)
+    from_name: str = Field(default="Funktechnik Schubert", max_length=255)
+    use_tls: bool = True
+    enabled: bool = False
+
+    @field_validator("host", "username", "password", "from_email", "from_name", mode="before")
+    @classmethod
+    def normalize_strings(cls, value: object) -> str:
+        return normalize_text(value)
+
+    @model_validator(mode="after")
+    def validate_enabled_configuration(self):
+        if self.enabled and (not self.host or not self.from_email):
+            raise ValueError("SMTP Host und Absenderadresse sind erforderlich, wenn SMTP aktiviert ist")
+        return self
+
+
+class SmtpTestRequest(BaseModel):
+    recipient: EmailStr
+
+
+class SmtpTestResponse(BaseModel):
+    success: bool
+    message: str
+    source: SettingsSource
+
+
+class PublicLinksSettingsResponse(BaseModel):
+    repair_status_base_url: str = ""
+    source: SettingsSource
+
+
+class PublicLinksSettingsUpdate(BaseModel):
+    repair_status_base_url: str = Field(default="", max_length=500)
+
+    @field_validator("repair_status_base_url", mode="before")
+    @classmethod
+    def normalize_url(cls, value: object) -> str:
+        return normalize_text(value).rstrip("/")