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Allow multiple groups per time slot in the week planner (#615)

Change WeekPlannerSlot from @ManyToOne to @ManyToMany relationship with
PlannerGroup, enabling users to assign multiple activity groups to a
single time slot. The suggestion engine randomly picks one group and then
a random activity within it, ensuring balanced coverage across groups.

Changes across all platforms:
- Shared model: ManyToMany join table (week_planner_slot_group_links)
- DayPlannerService: collect groups from slot.getGroups() set
- BackupData: groupId replaced with groupIds list
- FileSystem repo: serialize/deserialize group ID arrays with backward
  compatibility for old single-groupId format
- Webserver controller: resolve multiple group references on slot creation
- Desktop H2 repo: LEFT JOIN FETCH for eager group loading
- Android: new Room entity/DAO for join table, migration 11->12 preserving
  existing data, multi-select checkbox UI replacing single-group dropdown
- Tests updated across all modules

https://claude.ai/code/session_015GGkZFcN9jAM4SSYZuBMre

Co-authored-by: Claude <noreply@anthropic.com>

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