[REF] use single main branch with per-version config directories

Replace per-branch versioning (16.0, 18.0...) with a single main branch
containing version-specific subdirectories under config/.

Structure:
- config/common/: shared files deployed to all versions
- config/16.0/: Odoo 16.0 specific configs (pylintrc, ruff, pre-commit)

The deploy workflow now:
- Triggers on push to main
- Auto-detects available versions from config/*/
- For each target repo, deploys common + version-specific files

Also enables Gitea native cache in pre-commit workflow.

config/common/.gitea/workflows/pre-commit.yml

@@ -2,8 +2,6 @@ name: pre-commit
 
 on:
   pull_request:
-    branches:
-      - "16.0*"
 
 jobs:
   pre-commit:
@@ -15,7 +13,7 @@ jobs:
           python-version: "3.11"
       - name: Get python version
         run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
-      - uses: actions/cache@v4
+      - uses: https://gitea.com/actions/cache@v3
         with:
           path: ~/.cache/pre-commit
           key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}