[IMP] reorganize project directory structure

Restructure the project for better organization and maintainability:

New structure:
  ./upgrade.sh              - Main entry point (unchanged)
  ./lib/common.sh           - Shared bash functions
  ./lib/python/             - Python utility scripts
  ./scripts/                - Workflow scripts (prepare_db, finalize_db)
  ./config/                 - Configuration files (compose.yml)
  ./versions/{13..18}.0/    - Version-specific migration scripts

File renames:
  - pre_migration_view_checking.py -> lib/python/check_views.py
  - post_migration_fix_duplicated_views.py -> lib/python/fix_duplicated_views.py
  - post_migration_cleanup_obsolete_modules.py -> lib/python/cleanup_modules.py

Benefits:
  - Single entry point visible at root level
  - Clear separation between shared code, scripts, and config
  - Shorter, cleaner Python script names (context given by caller)
  - Easier navigation and maintenance

config/compose.yml

@@ -0,0 +1,90 @@
+ou12:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_12.0-MYC-INIT-3.7
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+ou13:
+   charm: odoo-tecnativa
+   docker-compose:
+     image: docker.0k.io/mirror/odoo:rc_13.0-MYC-INIT-OU
+     ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+     command:
+       - "--log-level=debug"
+       - "--limit-time-cpu=1000000"
+       - "--limit-time-real=1000000"
+   options:
+     workers: 0
+
+
+ou14:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_14.0-MYC-INIT
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+
+ou15:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_15.0-MYC-INIT
+      #image: docker.0k.io/mirror/odoo/rc_15.0-myc-init-20241007-092844-0f8b8b
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+ou16:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_16.0-ELABORE-LIGHT
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+ou17:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_17.0-MYC-INIT
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+ou18:
+  charm: odoo-tecnativa
+  docker-compose:
+    image: docker.0k.io/mirror/odoo:rc_18.0-ELABORE-LIGHT
+    ## Important to keep as a list: otherwise it'll overwrite charm's arguments.
+    command:
+      - "--log-level=debug"
+      - "--limit-time-cpu=1000000"
+      - "--limit-time-real=1000000"
+  options:
+    workers: 0
+
+postgres:
+  docker-compose:
+    image: docker.0k.io/postgres:17.2.0-myc