fix(odoo_17, odoo_18): provide odoo.conf via config mount and enable proxy_mode

Same root cause as odoo_19 (#1108, fixed in #1110): the compose file
bind-mounts ../files/config over /etc/odoo, but with mounts = [] the
directory is empty, hiding the image's /etc/odoo/odoo.conf. As a result
wait-for-psql.py crashes with configparser.NoSectionError: No section:
'options' and the web container never starts.

Ship odoo.conf through the template config mount instead, with
proxy_mode enabled so websocket/POS/livechat work behind Traefik.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

blueprints/odoo_17/template.toml

@@ -3,9 +3,17 @@ main_domain = "${domain}"
 
 [config]
 env = {}
-mounts = []
 
 [[config.domains]]
 serviceName = "web"
 port = 8_069
 host = "${main_domain}"
+
+[[config.mounts]]
+filePath = "config/odoo.conf"
+content = """
+[options]
+addons_path = /mnt/extra-addons
+data_dir = /var/lib/odoo
+proxy_mode = True
+"""

blueprints/odoo_18/template.toml

@@ -3,9 +3,17 @@ main_domain = "${domain}"
 
 [config]
 env = {}
-mounts = []
 
 [[config.domains]]
 serviceName = "web"
 port = 8_069
 host = "${main_domain}"
+
+[[config.mounts]]
+filePath = "config/odoo.conf"
+content = """
+[options]
+addons_path = /mnt/extra-addons
+data_dir = /var/lib/odoo
+proxy_mode = True
+"""