Remove ambiguous evidence level field from claims and the AI assistant.

Drops Evidenzlevel from models, admin, public UI, and draft workflow while keeping Nachweise file uploads unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>

claims/models.py

@@ -72,12 +72,6 @@ class Claim(models.Model):
         WISSENSCHAFTLICHER_KONSENS = 'wissenschaftlicher_konsens', 'Wissenschaftlicher Konsens'
         OFFENE_FRAGE = 'offene_frage', 'Offene Frage'
 
-    class EvidenceLevel(models.TextChoices):
-        SEHR_STARK = 'sehr_stark', 'Sehr stark'
-        STARK = 'stark', 'Stark'
-        MITTEL = 'mittel', 'Mittel'
-        SCHWACH = 'schwach', 'Schwach'
-
     category = models.ForeignKey(
         Category,
         on_delete=models.CASCADE,
@@ -94,12 +88,6 @@ class Claim(models.Model):
     )
     short_answer = models.TextField('Kurzantwort')
     detailed_explanation = models.TextField('Ausführliche Erklärung', blank=True)
-    evidence_level = models.CharField(
-        'Evidenzlevel',
-        max_length=20,
-        choices=EvidenceLevel.choices,
-        default=EvidenceLevel.MITTEL,
-    )
     tags = models.ManyToManyField(Tag, blank=True, verbose_name='Schlagwörter')
     created_at = models.DateTimeField('Erstellt am', auto_now_add=True)
     updated_at = models.DateTimeField('Aktualisiert am', auto_now=True)
@@ -137,15 +125,6 @@ class Claim(models.Model):
         }
         return mapping.get(self.status, 'secondary')
 
-    def get_evidence_badge_class(self):
-        mapping = {
-            self.EvidenceLevel.SEHR_STARK: 'success',
-            self.EvidenceLevel.STARK: 'primary',
-            self.EvidenceLevel.MITTEL: 'info',
-            self.EvidenceLevel.SCHWACH: 'warning',
-        }
-        return mapping.get(self.evidence_level, 'secondary')
-
 
 def evidence_upload_path(instance, filename):
     ext = os.path.splitext(filename)[1].lower().lstrip('.') or 'bin'
@@ -305,12 +284,6 @@ class ClaimDraft(models.Model):
     )
     short_answer = models.TextField('Kurzantwort', blank=True)
     detailed_explanation = models.TextField('Ausführliche Erklärung', blank=True)
-    evidence_level = models.CharField(
-        'Evidenzlevel',
-        max_length=20,
-        choices=Claim.EvidenceLevel.choices,
-        blank=True,
-    )
     tags = models.JSONField('Schlagwörter', default=list, blank=True)
     sources = models.JSONField('Quellen', default=list, blank=True)
     counter_arguments = models.JSONField('Gegenargumente', default=list, blank=True)