chore: bump viem floor to ^2.48.11 across monorepo + refresh lockfiles

Tightens the viem floor in every package.json that lists viem (41 refs
across 40 files), refreshes all three lockfiles so every direct viem
resolution reads 2.48.11, and regenerates the paywall bundled templates
so the EVM/SVM/AVM bundles match the new viem chain database.

## Why floor-tightening matters

PR x402-foundation#2013 bumped lockfiles to 2.47.14, but later PRs (x402-foundation#2061, x402-foundation#2197, ...)
added sub-packages with ^2.39.x / ^2.43.x floors. pnpm re-resolved on
subsequent installs and the solver picked the lowest acceptable version
across constraints. ^-ranges with low floors do NOT preserve a bump --
lockfile refreshes erode the floor.

This PR fixes that incomplete tightening from x402-foundation#2013 by raising every
floor to ^2.48.11. The same regression will recur if any future PR adds
a viem-using sub-package with a lower floor. Gate criterion: new
packages must use ^2.48.11 (or tighter) for viem.

## Acceptance verification

- pnpm install --frozen-lockfile clean across typescript/,
  examples/typescript/, and e2e/.
- pnpm format:check, lint:check, build, test green for typescript/.
- pnpm format:check, lint:check green for examples/typescript/.
- All direct viem resolutions read 2.48.11 in all three workspaces.
- Paywall bundled templates regenerated via
  pnpm --filter @x402/paywall run build:paywall.

Author: ryanRfox

e2e/clients/axios/package.json

@@ -23,7 +23,7 @@
     "@x402/svm": "workspace:*",
     "axios": "^1.7.9",
     "dotenv": "^16.4.7",
-    "viem": "^2.21.26"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",

e2e/clients/fetch/package.json

@@ -23,7 +23,7 @@
     "@x402/svm": "workspace:*",
     "axios": "^1.7.9",
     "dotenv": "^16.4.7",
-    "viem": "^2.21.26"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",

e2e/clients/mcp-typescript/package.json

@@ -14,7 +14,7 @@
     "@x402/core": "workspace:*",
     "@x402/evm": "workspace:*",
     "@x402/mcp": "workspace:*",
-    "viem": "^2.21.26"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",

e2e/facilitators/typescript/package.json

@@ -25,7 +25,7 @@
     "@x402/svm": "workspace:*",
     "dotenv": "^16.4.5",
     "express": "^4.19.2",
-    "viem": "^2.21.54"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@types/express": "^4.17.21",

e2e/legacy/clients/axios/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "axios": "^1.7.9",
     "dotenv": "^16.5.0",
-    "viem": "^2.21.26",
+    "viem": "^2.48.11",
     "x402-axios": "workspace:*"
   },
   "devDependencies": {

e2e/legacy/clients/fetch/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "axios": "^1.7.9",
     "dotenv": "^16.4.7",
-    "viem": "^2.21.26",
+    "viem": "^2.48.11",
     "x402-fetch": "workspace:*"
   },
   "devDependencies": {

e2e/legacy/servers/next/package.json

@@ -17,7 +17,7 @@
     "next": "^15.5.9",
     "react": "19.2.3",
     "react-dom": "19.2.3",
-    "viem": "^2.21.26",
+    "viem": "^2.48.11",
     "x402-next": "workspace:*"
   },
   "devDependencies": {

e2e/package.json

@@ -21,7 +21,7 @@
     "express": "^4.18.0",
     "prompts": "^2.4.2",
     "tsx": "^4.20.3",
-    "viem": "^2.0.0"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@types/express": "^4.17.0",

e2e/pnpm-lock.yaml

@@ -26,7 +26,7 @@
     "next": "^16.0.10",
     "react": "^19.2.3",
     "react-dom": "^19.2.3",
-    "viem": "^2.21.26"
+    "viem": "^2.48.11"
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",