feat: add Redis caching for recipe queries with automatic invalidation

Implements Redis caching layer for recipe endpoints to reduce MongoDB load and improve response times:

- Install ioredis for Redis client with TypeScript support
- Create cache.ts with namespaced keys (homepage: prefix) to avoid conflicts with other Redis applications
- Add caching to recipe query endpoints (all_brief, by tag, in_season) with 1-hour TTL
- Implement automatic cache invalidation on recipe create/edit/delete operations
- Cache recipes before randomization to maximize cache reuse while maintaining random order per request
- Add graceful fallback to MongoDB if Redis is unavailable
- Update .env.example with Redis configuration (REDIS_HOST, REDIS_PORT)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -20,6 +20,9 @@ importers:
       cheerio:
         specifier: 1.0.0-rc.12
         version: 1.0.0-rc.12
+      ioredis:
+        specifier: ^5.9.0
+        version: 5.9.0
       mongoose:
         specifier: ^8.0.0
         version: 8.18.0(socks@2.7.1)
@@ -437,6 +440,9 @@ packages:
     cpu: [x64]
     os: [win32]
 
+  '@ioredis/commands@1.5.0':
+    resolution: {integrity: sha512-eUgLqrMf8nJkZxT24JvVRrQya1vZkQh8BBeYNwGDqa5I0VUi8ACx7uFvAaLxintokpTenkK6DASvo/bvNbBGow==}
+
   '@jridgewell/gen-mapping@0.3.13':
     resolution: {integrity: sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==}
 
@@ -822,6 +828,10 @@ packages:
     resolution: {integrity: sha512-eYm0QWBtUrBWZWG0d386OGAw16Z995PiOVo2B7bjWSbHedGl5e0ZWaq65kOGgUSNesEIDkB9ISbTg/JK9dhCZA==}
     engines: {node: '>=6'}
 
+  cluster-key-slot@1.1.2:
+    resolution: {integrity: sha512-RMr0FhtfXemyinomL4hrWcYJxmX6deFdCxpJzhDttxgO1+bcCnkk+9drydLVDmAMG7NE6aN/fl4F7ucU/90gAA==}
+    engines: {node: '>=0.10.0'}
+
   color-convert@2.0.1:
     resolution: {integrity: sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==}
     engines: {node: '>=7.0.0'}
@@ -899,6 +909,10 @@ packages:
     resolution: {integrity: sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A==}
     engines: {node: '>=0.10.0'}
 
+  denque@2.1.0:
+    resolution: {integrity: sha512-HVQE3AAb/pxF8fQAoiqpvg9i3evqug3hoiwakOyZAwJm+6vZehbkYXZ0l4JxS+I3QxM97v5aaRNhj8v5oBhekw==}
+    engines: {node: '>=0.10'}
+
   dequal@2.0.3:
     resolution: {integrity: sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==}
     engines: {node: '>=6'}
@@ -1016,6 +1030,10 @@ packages:
     resolution: {integrity: sha512-EdDDZu4A2OyIK7Lr/2zG+w5jmbuk1DVBnEwREQvBzspBJkCEbRa8GxU1lghYcaGJCnRWibjDXlq779X1/y5xwg==}
     engines: {node: '>=8'}
 
+  ioredis@5.9.0:
+    resolution: {integrity: sha512-T3VieIilNumOJCXI9SDgo4NnF6sZkd6XcmPi6qWtw4xqbt8nNz/ZVNiIH1L9puMTSHZh1mUWA4xKa2nWPF4NwQ==}
+    engines: {node: '>=12.22.0'}
+
   ip@2.0.1:
     resolution: {integrity: sha512-lJUL9imLTNi1ZfXT+DU6rBBdbiKGBuay9B6xGSPVjUeQwaH1RIGqef8RZkUtHioLmSNpPR5M4HVKJGm1j8FWVQ==}
 
@@ -1063,6 +1081,12 @@ packages:
   locate-character@3.0.0:
     resolution: {integrity: sha512-SW13ws7BjaeJ6p7Q6CO2nchbYEc3X3J6WrmTTDto7yMPqVSZTUyY5Tjbid+Ab8gLnATtygYtiDIJGQRRn2ZOiA==}
 
+  lodash.defaults@4.2.0:
+    resolution: {integrity: sha512-qjxPLHd3r5DnsdGacqOMU6pb/avJzdh9tFX2ymgoZE27BmjXrNy/y4LoaiTeAb+O3gL8AfpJGtqfX/ae2leYYQ==}
+
+  lodash.isarguments@3.1.0:
+    resolution: {integrity: sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg==}
+
   lru-cache@11.2.2:
     resolution: {integrity: sha512-F9ODfyqML2coTIsQpSkRHnLSZMtkU8Q+mSfcaIyKwy58u+8k5nvAYeiNhsyMARvzNcXJ9QfWVrcPsC9e9rAxtg==}
     engines: {node: 20 || >=22}
@@ -1228,6 +1252,14 @@ packages:
     resolution: {integrity: sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==}
     engines: {node: '>=8'}
 
+  redis-errors@1.2.0:
+    resolution: {integrity: sha512-1qny3OExCf0UvUV/5wpYKf2YwPcOqXzkwKKSmKHiE6ZMQs5heeE/c8eXK+PNllPvmjgAbfnsbpkGZWy8cBpn9w==}
+    engines: {node: '>=4'}
+
+  redis-parser@3.0.0:
+    resolution: {integrity: sha512-DJnGAeenTdpMEH6uAJRK/uiyEIH9WVsUmoLwzudwGJUwZPp80PDBWPHXSAGNPwNvIXAbe7MSUB1zQFugFml66A==}
+    engines: {node: '>=4'}
+
   require-from-string@2.0.2:
     resolution: {integrity: sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==}
     engines: {node: '>=0.10.0'}
@@ -1302,6 +1334,9 @@ packages:
   stackback@0.0.2:
     resolution: {integrity: sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==}
 
+  standard-as-callback@2.1.0:
+    resolution: {integrity: sha512-qoRRSyROncaz1z0mvYqIE4lCd9p2R90i6GxW3uZv5ucSu8tU7B5HXUP1gG8pVZsYNVaXjk8ClXHPttLyxAL48A==}
+
   std-env@3.10.0:
     resolution: {integrity: sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==}
 
@@ -1746,6 +1781,8 @@ snapshots:
   '@img/sharp-win32-x64@0.33.5':
     optional: true
 
+  '@ioredis/commands@1.5.0': {}
+
   '@jridgewell/gen-mapping@0.3.13':
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
@@ -2111,6 +2148,8 @@ snapshots:
 
   clsx@2.1.1: {}
 
+  cluster-key-slot@1.1.2: {}
+
   color-convert@2.0.1:
     dependencies:
       color-name: 1.1.4
@@ -2175,6 +2214,8 @@ snapshots:
 
   deepmerge@4.3.1: {}
 
+  denque@2.1.0: {}
+
   dequal@2.0.3: {}
 
   detect-libc@2.0.4: {}
@@ -2303,6 +2344,20 @@ snapshots:
 
   indent-string@4.0.0: {}
 
+  ioredis@5.9.0:
+    dependencies:
+      '@ioredis/commands': 1.5.0
+      cluster-key-slot: 1.1.2
+      debug: 4.4.3
+      denque: 2.1.0
+      lodash.defaults: 4.2.0
+      lodash.isarguments: 3.1.0
+      redis-errors: 1.2.0
+      redis-parser: 3.0.0
+      standard-as-callback: 2.1.0
+    transitivePeerDependencies:
+      - supports-color
+
   ip@2.0.1:
     optional: true
 
@@ -2361,6 +2416,10 @@ snapshots:
 
   locate-character@3.0.0: {}
 
+  lodash.defaults@4.2.0: {}
+
+  lodash.isarguments@3.1.0: {}
+
   lru-cache@11.2.2: {}
 
   lz-string@1.5.0: {}
@@ -2499,6 +2558,12 @@ snapshots:
       indent-string: 4.0.0
       strip-indent: 3.0.0
 
+  redis-errors@1.2.0: {}
+
+  redis-parser@3.0.0:
+    dependencies:
+      redis-errors: 1.2.0
+
   require-from-string@2.0.2: {}
 
   resolve@1.22.2:
@@ -2613,6 +2678,8 @@ snapshots:
 
   stackback@0.0.2: {}
 
+  standard-as-callback@2.1.0: {}
+
   std-env@3.10.0: {}
 
   strip-indent@3.0.0: