chore(deps): upgrade all dependencies to latest and pin exact

Policy: every direct dependency is now an exact pin; lockfile + --frozen-lockfile keep builds reproducible; save-exact=true enforced.

Toolchain:
- pnpm 10.26 -> 11.18 (lockfile migrated; supportedArchitectures moved to pnpm-workspace.yaml)
- typescript 5.9 -> 7.0, vite 7 -> 8, @vitejs/plugin-react 5 -> 6
- esbuild override 0.27.3 -> 0.28.1 (closes GHSA-g7r4-m6w7-qqqr); added @esbuild/darwin-arm64 for local dev
- orval 8.9 -> 8.23, regenerated clients

Backend (prod image):
- openid-client 5.7 -> 6.8 (rewritten OIDC flow in routes/auth.ts: discovery + functional API, PKCE/state, fetchUserInfo, buildEndSessionUrl)
- pino 9 -> 10, pino-http 10 -> 11, thread-stream 3 -> 4
- zod 3.25 -> 4.4 (catalog; supported by drizzle-zod 0.8.3)
- pg 8.20 -> 8.22; removed deprecated @types/bcryptjs

Frontend:
- react/react-dom 19.1.0 -> 19.2.8 (catalog pin lifted; expo note removed)
- react-day-picker 9 -> 10 (table classname -> month_grid)
- recharts 2 -> 3 (TooltipContentProps + DefaultLegendContentProps typing; safe keys)
- react-resizable-panels 2 -> 4 (Group/Separator rename)
- date-fns 3 -> 4, @hookform/resolvers 3 -> 5, lucide-react 0.545 -> 1.28
- all @radix-ui/*, tailwind, types, and remaining patch/minor deps bumped to latest

Security/process:
- overrides for body-parser >=2.3.0 (GHSA-v422-hmwv-36x6) + markdown-it/linkify-it/brace-expansion/fast-uri (dev tooling)
- pnpm audit now reports 0 vulnerabilities (prod and full)
- CI audit gate added to build.yaml; docs/dependency-policy.md; renovate.json
- Dockerfile pins node:24.18.1-alpine and pnpm@11.18.0

lib/db/package.json

@@ -13,13 +13,13 @@
   },
   "dependencies": {
     "drizzle-orm": "catalog:",
-    "drizzle-zod": "^0.8.3",
-    "pg": "^8.20.0",
+    "drizzle-zod": "0.8.3",
+    "pg": "8.22.0",
     "zod": "catalog:"
   },
   "devDependencies": {
     "@types/node": "catalog:",
-    "@types/pg": "^8.20.0",
-    "drizzle-kit": "^0.31.10"
+    "@types/pg": "8.20.3",
+    "drizzle-kit": "0.31.10"
   }
 }