build: use bun for installs and pin better-auth core deps

Railpack builds the Dokploy app from the app's build path, which is
apps/web — a dir with no bun.lock (it lives at the monorepo root), so
Railpack fell back to npm. npm then resolved @better-auth/core's ^1.6.22
peer to 1.7.0 while the pinned plugins peer better-call@1.3.7, causing
ERESOLVE and failing the build.

- Declare packageManager: bun@1.3.14 at the root (Railpack's
  highest-priority signal; combined with removing the Dokploy build path,
  installs run 'bun install --frozen-lockfile' at the workspace root).
- Add npm overrides (@better-auth/core 1.6.22, better-call 1.3.7) in
  root + apps/web as a safety net so any npm-based build resolves too.
- Verified: isolated npm install resolves (698 pkgs), bun install is a
  no-op (1020 pkgs, versions unchanged), full next build passes.

apps/web/package.json

@@ -84,6 +84,8 @@
   ],
   "overrides": {
     "@types/react": "19.2.14",
-    "@types/react-dom": "19.2.3"
+    "@types/react-dom": "19.2.3",
+    "@better-auth/core": "1.6.22",
+    "better-call": "1.3.7"
   }
 }

bun.lock

@@ -106,8 +106,10 @@
     "unrs-resolver",
   ],
   "overrides": {
+    "@better-auth/core": "1.6.22",
     "@types/react": "19.2.14",
     "@types/react-dom": "19.2.3",
+    "better-call": "1.3.7",
   },
   "packages": {
     "@alloc/quick-lru": ["@alloc/quick-lru@5.2.0", "", {}, "sha512-UrcABB+4bUrFABwbluTIBErXwvbsU/V7TZWfmbgJfbkwiBuziS9gxdODUyuiecfdGQ85jglMW6juS3+z5TsKLw=="],

package.json

@@ -1,7 +1,11 @@
 {
   "name": "deckyvault",
   "private": true,
-  "workspaces": ["apps/*", "packages/*", "plugins/*"],
+  "workspaces": [
+    "apps/*",
+    "packages/*",
+    "plugins/*"
+  ],
   "scripts": {
     "dev": "bun run --filter @deckyvault/web dev",
     "build": "bun run --filter @deckyvault/web build",
@@ -20,12 +24,18 @@
     "plugin:release": "bun run --filter @deckyvault/plugin release",
     "plugin:deploy": "bun run --filter @deckyvault/plugin build && bash plugins/decky-vault/scripts/deploy.sh"
   },
-  "trustedDependencies": ["sharp", "unrs-resolver"],
+  "trustedDependencies": [
+    "sharp",
+    "unrs-resolver"
+  ],
   "overrides": {
     "@types/react": "19.2.14",
-    "@types/react-dom": "19.2.3"
+    "@types/react-dom": "19.2.3",
+    "@better-auth/core": "1.6.22",
+    "better-call": "1.3.7"
   },
   "dependencies": {
     "better-auth": "1.6.22"
-  }
+  },
+  "packageManager": "bun@1.3.14"
 }