refactor: simplify codebase and replace external dependencies with Bun built-ins

Backend changes:
- Merge duplicate award logic (calculatePointsAwardProgress + getPointsAwardEntityBreakdown)
- Simplify LoTW service (merge syncQSOs functions, simplify polling)
- Remove job queue abstraction (hardcode LoTW sync, remove processor registry)
- Consolidate config files (database.js, logger.js, jwt.js → single config.js)
- Replace bcrypt with Bun.password.hash/verify
- Replace Pino logger with console-based logger
- Fix: export syncQSOs and getLastLoTWQSLDate for job queue imports
- Fix: correct database path resolution using new URL()

Frontend changes:
- Simplify auth store (remove localStorage wrappers, reduce from 222→109 lines)
- Consolidate API layer (remove verbose JSDoc, 180→80 lines)
- Add shared UI components (Loading, ErrorDisplay, BackButton)

Dependencies:
- Remove bcrypt (replaced with Bun.password)
- Remove pino and pino-pretty (replaced with console logger)

Total: ~445 lines removed (net), 3 dependencies removed
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/index.js

@@ -1,8 +1,7 @@
 import { Elysia, t } from 'elysia';
 import { cors } from '@elysiajs/cors';
 import { jwt } from '@elysiajs/jwt';
-import { JWT_SECRET } from './config/jwt.js';
-import logger from './config/logger.js';
+import { JWT_SECRET, logger } from './config.js';
 import {
   registerUser,
   authenticateUser,
@@ -249,21 +248,7 @@ const app = new Elysia()
     }
 
     try {
-      const userData = await getUserById(user.id);
-
-      if (!userData || !userData.lotwUsername || !userData.lotwPassword) {
-        logger.debug('/api/lotw/sync: Missing LoTW credentials', { userId: user.id });
-        set.status = 400;
-        return {
-          success: false,
-          error: 'LoTW credentials not configured. Please add them in Settings.',
-        };
-      }
-
-      const result = await enqueueJob(user.id, 'lotw_sync', {
-        lotwUsername: userData.lotwUsername,
-        lotwPassword: userData.lotwPassword,
-      });
+      const result = await enqueueJob(user.id);
 
       if (!result.success && result.existingJob) {
         return {