Security fixes: P0-P2 complete (22 fixes)

P0 (7): Auth-bypass removed, migrations fixed, plugin-upload disabled, RLS FORCE+WITH CHECK, plugin double-registration fixed, persistent volume, domain removed
P1 (11): User/tenant model, Redis centralized, worker separated, transactional outbox, XSS fixed, DMS chunked streaming, permissions unified, password reset, metrics secured, config/docs fixed, cross-tenant FK
P2 (4): Contact model normalized, cross-imports reduced 94%, commands+state machines for contacts/dms/mail/calendar, SPA path-traversal

8 new migrations, 99 unit tests, 13 commands, 8 contracts, 72 files changed

frontend/package-lock.json

@@ -25,9 +25,11 @@
         "@tiptap/pm": "^3.28.0",
         "@tiptap/react": "^3.28.0",
         "@tiptap/starter-kit": "^3.28.0",
+        "@types/dompurify": "^3.2.0",
         "axios": "^1.7.7",
         "clsx": "^2.1.1",
         "date-fns": "^4.4.0",
+        "dompurify": "^3.4.12",
         "i18next": "^23.14.0",
         "i18next-browser-languagedetector": "^8.0.0",
         "lucide-react": "^1.25.0",
@@ -3485,6 +3487,15 @@
         "@types/ms": "*"
       }
     },
+    "node_modules/@types/dompurify": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@types/dompurify/-/dompurify-3.2.0.tgz",
+      "integrity": "sha512-Fgg31wv9QbLDA0SpTOXO3MaxySc4DKGLi8sna4/Utjo4r3ZRPdCt4UQee8BWr+Q5z21yifghREPJGYaEOEIACg==",
+      "deprecated": "This is a stub types definition. dompurify provides its own type definitions, so you do not need this installed.",
+      "dependencies": {
+        "dompurify": "*"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -3551,7 +3562,7 @@
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
       "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
-      "dev": true
+      "devOptional": true
     },
     "node_modules/@types/unist": {
       "version": "3.0.3",
@@ -4733,6 +4744,14 @@
       "dev": true,
       "peer": true
     },
+    "node_modules/dompurify": {
+      "version": "3.4.12",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.12.tgz",
+      "integrity": "sha512-zQvGet8Z2sWbQhCmfFz/T5QWH2oBmjnqK3qvOjaqaNLrLEF912WamU+ohnTp0TCep/MFVHpdJuCZEdFOdTnEFg==",
+      "optionalDependencies": {
+        "@types/trusted-types": "^2.0.7"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",