feat: Global-Admin Org-Switcher fuer info@aegis-sight.de

Ermoeglicht dem Global Admin (is_global_admin Flag) zwischen
Organisationen zu wechseln. Neue Endpoints: GET /api/auth/organizations,
POST /api/auth/switch-org. Org-Dropdown im Header-Menue, nur fuer
Global Admin sichtbar. Komplett herausnehmbar (Flag + Code-Bloecke).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/models.py

@@ -40,6 +40,7 @@ class UserMeResponse(BaseModel):
     credits_total: Optional[int] = None
     credits_remaining: Optional[int] = None
     credits_percent_used: Optional[float] = None
+    is_global_admin: bool = False
 
 
 # Incidents (Lagen)
@@ -206,3 +207,16 @@ class FeedbackRequest(BaseModel):
     message: str = Field(min_length=10, max_length=5000)
 
 
+
+
+# --- Global Admin: Org-Wechsel (herausnehmbar) ---
+
+class SwitchOrgRequest(BaseModel):
+    organization_id: int
+
+
+class OrgListItem(BaseModel):
+    id: int
+    name: str
+    slug: str
+    is_active: bool