Make module installable on stock Odoo 18 (verified via test DB install)

Caught and fixed by running an actual install on a throwaway DB:

- Strip 29 # comment lines from ir.model.access.csv (Odoo CSV loader treats
  them as malformed rows → IndexError); 79 data rows preserved
- Remove obsolete ir.cron.numbercall field (removed in Odoo 17+) from 4 cron
  records in fl_deadline_rules.xml
- Rename <tree>→<list> across 26 sites; inside x2many inline views Odoo 18 no
  longer recognizes <tree>, which made it fall back to the outer model and
  reject inner fields ("Field 'partner_id' does not exist in model 'fl.case'")
- Add store=True to non-stored computed fields referenced by search filters,
  which Odoo 18 now rejects as unsearchable:
  - fl.case: overdue_deadline_count, next_deadline_label
  - fl.deposition: notice_valid

Module loads cleanly: 31 fl.* models registered, no errors.

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

activeblue_familylaw/views/fl_support_views.xml

@@ -120,7 +120,7 @@
             <field name="name">fl.support.calculation.tree</field>
             <field name="model">fl.support.calculation</field>
             <field name="arch" type="xml">
-                <tree string="Support Calculations">
+                <list string="Support Calculations">
                     <field name="case_id"/>
                     <field name="calculation_date"/>
                     <field name="calculation_type"/>
@@ -129,7 +129,7 @@
                     <field name="total_support_obligation"/>
                     <field name="net_payment_amount"/>
                     <field name="payment_direction"/>
-                </tree>
+                </list>
             </field>
         </record>
 
@@ -140,14 +140,14 @@
             <field name="name">fl.support.schedule.entry.tree</field>
             <field name="model">fl.support.schedule.entry</field>
             <field name="arch" type="xml">
-                <tree string="FL Support Schedule">
+                <list string="FL Support Schedule">
                     <field name="income_min"/>
                     <field name="income_max"/>
                     <field name="children_count"/>
                     <field name="obligation_amount"/>
                     <field name="effective_date"/>
                     <field name="active"/>
-                </tree>
+                </list>
             </field>
         </record>