refactor: Phase 1 code consolidation and service layer setup

Phase 1.1: Shared parsers utility
- Create backend/src/utils/parsers.js with parseBooleanInput, parseStringInput, etc.
- Create frontend/src/utils/parsers.ts with TypeScript equivalents
- Update routes to import from shared parsers

Phase 1.2: Auth routes consolidation
- Merge auth.js, auth-enhanced.js, auth-enhanced-v2.js into single auth.js
- Add password change and password strength endpoints
- Consolidate middleware (auth.js with token revocation support)
- Update all imports across 14+ route files

Phase 1.3: CreateEvent page consolidation
- Remove duplicate CreateEventPage.tsx (basic version)
- Rename CreateEventPageEnhanced.tsx to CreateEventPage.tsx
- Update exports and imports

Phase 1.4: CMS page consolidation
- Remove duplicate CMSPage.tsx (basic version)
- Rename CMSPageEnhanced.tsx to CMSPage.tsx
- Update exports and imports

Phase 1.5: Multer config factory
- Create backend/src/config/multerConfig.js
- Centralized upload configuration with presets for photos, logos, favicons
- Reusable helpers: createDiskStorage, createFileFilter, uploadTimeoutMiddleware

Phase 2.1: Event service layer
- Create backend/src/services/eventService.js
- Move event business logic out of routes
- Functions: createEvent, getAllEvents, updateEvent, deleteEvent, extendExpiration

backend/package-lock.json

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@@ -1025,6 +1026,7 @@
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       "dev": true,
       "license": "MIT",
+      "peer": true,
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@@ -3831,6 +3833,7 @@
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       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
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@@ -4431,6 +4434,7 @@
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       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
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         "caniuse-lite": "^1.0.30001754",
@@ -5396,29 +5400,6 @@
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-      "integrity": "sha512-ETBauow1T35Y/WZMkio9jiM0Z5xjHHmJ4XmjZOq1l/dXz3lr2sRn87nJy20RupqSh1F2m3HHPSp8ShIPQJrJ3A==",
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-    "node_modules/encoding/node_modules/iconv-lite": {
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-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
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     "node_modules/end-of-stream": {
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       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
@@ -5546,6 +5527,7 @@
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@@ -6703,6 +6685,7 @@
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       "license": "MIT",
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       "dependencies": {
         "@babel/runtime": "^7.27.6"
       },