fix: resolve CI failures - golangci-lint v2 and npm peer deps

- Upgrade golangci-lint-action to v7 with v2.1 (supports Go 1.25)
- Use npm install --legacy-peer-deps instead of npm ci for web builds

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -15,9 +15,9 @@ jobs:
         with:
           go-version: "1.25"
 
-      - uses: golangci/golangci-lint-action@v6
+      - uses: golangci/golangci-lint-action@v7
         with:
-          version: latest
+          version: v2.1
 
   test:
     name: Test
@@ -37,7 +37,7 @@ jobs:
 
       - name: Build web frontend
         run: |
-          cd web && npm ci && npm run build
+          cd web && npm install --legacy-peer-deps && npm run build
 
       - name: Copy web assets
         run: |

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Build web frontend
         run: |
-          cd web && npm ci && npm run build
+          cd web && npm install --legacy-peer-deps && npm run build
 
       - name: Copy web assets
         run: |
@@ -99,7 +99,7 @@ jobs:
 
       - name: Build web frontend
         run: |
-          cd web && npm ci && npm run build
+          cd web && npm install --legacy-peer-deps && npm run build
 
       - name: Copy web assets
         run: |