fix: correct Renovate configuration issues

- Remove global-only options (platform, repositories, username) from renovate.json
- Fix invalid schedule syntax: 'every day' -> 'before 5am'
- Update workflow to use 'forgejo' platform instead of 'gitea'
- These options are properly set via environment variables in the workflow

.forgejo/workflows/renovate.yaml

@@ -17,7 +17,7 @@ jobs:
 
       - name: Run Renovate
         env:
-          RENOVATE_PLATFORM: gitea
+          RENOVATE_PLATFORM: forgejo
           RENOVATE_ENDPOINT: ${{ secrets.FORGEJO_ENDPOINT }}
           RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
           RENOVATE_GIT_AUTHOR: Renovate Bot <bot@renovateapp.com>

renovate.json

@@ -1,15 +1,12 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["config:base"],
-  "platform": "gitea",
-  "username": "renovate[bot]",
   "gitAuthor": "Renovate Bot <bot@renovateapp.com>",
-  "repositories": ["graham/aprs.me"],
   "branchPrefix": "renovate/",
   "semanticCommits": "enabled",
   "dependencyDashboard": true,
   "labels": ["dependencies"],
-  "schedule": ["every day"],
+  "schedule": ["before 5am"],
   "timezone": "UTC",
   "prConcurrentLimit": 10,
   "prCreation": "immediate",