feat(profile): implement user-initiated GDPR-compliant profile deletion

- Add DELETE /users/me endpoint with cascading data removal
- Implement frontend confirmation dialog and deletion flow
- Add audit logging for deletion requests
- Update localization files for new UI strings
- Add scheduled cleanup service for AI traces
- Document GDPR compliance in technical specification

BREAKING CHANGE: Users can now permanently delete their profiles and associated data

backend/package-lock.json

@@ -14,6 +14,7 @@
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         "@nestjs/passport": "^11.0.5",
         "@nestjs/platform-express": "^11.1.19",
+        "@nestjs/schedule": "^6.1.3",
         "@nestjs/throttler": "^6.4.0",
         "@prisma/client": "6.12.0",
         "bcryptjs": "^2.4.3",
@@ -2319,6 +2320,19 @@
         "@nestjs/core": "^11.0.0"
       }
     },
+    "node_modules/@nestjs/schedule": {
+      "version": "6.1.3",
+      "resolved": "https://registry.npmjs.org/@nestjs/schedule/-/schedule-6.1.3.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "cron": "4.4.0"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^10.0.0 || ^11.0.0",
+        "@nestjs/core": "^10.0.0 || ^11.0.0"
+      }
+    },
     "node_modules/@nestjs/schematics": {
       "version": "11.1.0",
       "resolved": "https://registry.npmjs.org/@nestjs/schematics/-/schematics-11.1.0.tgz",
@@ -2752,6 +2766,12 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/luxon": {
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/@types/luxon/-/luxon-3.7.1.tgz",
+      "integrity": "sha512-H3iskjFIAn5SlJU7OuxUmTEpebK6TKB8rxZShDslBMZJ5u9S//KM1sbdAisiSrqwLQncVjnpi2OK2J51h+4lsg==",
+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/@types/methods/-/methods-1.1.4.tgz",
@@ -4508,6 +4528,23 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/cron": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/cron/-/cron-4.4.0.tgz",
+      "integrity": "sha512-fkdfq+b+AHI4cKdhZlppHveI/mgz2qpiYxcm+t5E5TsxX7QrLS1VE0+7GENEk9z0EeGPcpSciGv6ez24duWhwQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/luxon": "~3.7.0",
+        "luxon": "~3.7.0"
+      },
+      "engines": {
+        "node": ">=18.x"
+      },
+      "funding": {
+        "type": "ko-fi",
+        "url": "https://ko-fi.com/intcreator"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -7329,6 +7366,15 @@
         "node": "20 || >=22"
       }
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+    "node_modules/luxon": {
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/luxon/-/luxon-3.7.2.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/magic-string": {
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       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.17.tgz",