feat: add feedback submission schema

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/schemas/feedback.py

@@ -0,0 +1,21 @@
+from enum import Enum
+from pydantic import BaseModel, EmailStr, Field
+
+
+class FeedbackType(str, Enum):
+    BUG_REPORT = "Bug Report"
+    FEATURE_REQUEST = "Feature Request"
+    USABILITY_ISSUE = "Usability Issue"
+    DOCUMENTATION = "Documentation"
+    GENERAL = "General Feedback"
+
+
+class FeedbackSubmission(BaseModel):
+    email: EmailStr
+    feedback_type: FeedbackType
+    message: str = Field(..., min_length=10, max_length=5000)
+
+
+class FeedbackResponse(BaseModel):
+    success: bool
+    message: str