refactor: comprehensive codebase cleanup and architecture hardening

- Sprint 1 (Quick Wins): Remove dead analytics modules, fix 4 unresolved
  imports, replace 3 console.warn with logger, remove mock-crc import
- Sprint 2 (Architecture): Create MascotChatRepository, AnalysisRepository,
  3 Zod schemas (mascot-chat, analysis, voice), deduplicate error classes,
  move 3 SQL queries from routes to repository
- Sprint 3 (Complexity): Replace 7 any types with proper interfaces,
  extract 6 helpers from prepareMediaMessage (CC 85 -> ~15)
- Sprint 4 (Config): Remove 22 dead env vars from .env, add 30 missing
  vars to .env.example, standardize naming

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/shared/src/errors/index.ts

@@ -21,11 +21,7 @@ export class ValidationError extends AppError {
 
 export class NotFoundError extends AppError {
   constructor(resource: string, id?: string) {
-    super(
-      `${resource} not found${id ? `: ${id}` : ""}`,
-      "NOT_FOUND",
-      404,
-    );
+    super(`${resource} not found${id ? `: ${id}` : ""}`, "NOT_FOUND", 404);
     this.name = "NotFoundError";
   }
 }

packages/shared/src/utils/index.ts

@@ -96,7 +96,7 @@ export async function retryWithBackoff<T>(
       err.name = "AbortError";
       throw err;
     }
-    
+
     try {
       return await fn();
     } catch (err) {
@@ -109,7 +109,7 @@ export async function retryWithBackoff<T>(
         minTimeout * factor ** attempt + Math.random() * 100,
         maxTimeout,
       );
-      
+
       await new Promise<void>((resolve, reject) => {
         let timeoutId: NodeJS.Timeout;
         const onAbort = () => {
@@ -119,12 +119,12 @@ export async function retryWithBackoff<T>(
           reject(abortErr);
         };
         if (signal?.aborted) return onAbort();
-        
+
         timeoutId = setTimeout(() => {
           if (signal) signal.removeEventListener("abort", onAbort);
           resolve();
         }, backoff);
-        
+
         if (signal) signal.addEventListener("abort", onAbort, { once: true });
       });
     }