FRE-4517, FRE-4499: Complete SpamShield implementation and billing updates

- SpamFeedback table migration with timestamp index
- Real-time interception engine completion
- Billing service enhancements
- Classifier and rule engine updates

Co-Authored-By: Paperclip <noreply@paperclip.ing>

services/spamshield/src/engine/rule-engine.ts

@@ -1,4 +1,5 @@
 import { PrismaClient, SpamRule } from '@prisma/client';
+import { generateRequestId } from '@shieldai/types';
 
 export interface RuleMatch {
   ruleId: string;
@@ -78,7 +79,7 @@ export class RuleEngine {
           });
         }
       } catch (error) {
-        console.error(`[RuleEngine] Invalid pattern for rule ${rule.id}:`, error);
+        console.error(`[RuleEngine] [req:${generateRequestId()}] Invalid pattern for rule ${rule.id}:`, error);
       }
     }
 
@@ -106,7 +107,7 @@ export class RuleEngine {
           });
         }
       } catch (error) {
-        console.error(`[RuleEngine] Invalid pattern for rule ${rule.id}:`, error);
+        console.error(`[RuleEngine] [req:${generateRequestId()}] Invalid pattern for rule ${rule.id}:`, error);
       }
     }