feat: enhance POS Next functionality with new hooks and manager desk setup

[MohamedAliSmk]

• Updated hooks.py to include before_request and on_session_creation events for runtime patches and CRM role management.
• Modified install.py to call setup_manager_desk during installation and migration processes.
• Updated various JSON files for POS documents and reports to include new roles, descriptions, and dynamic row formats.
• Adjusted modified timestamps and added new permissions for the Nexus POS Manager role across multiple documents.

[engahmed1190]

Cross-repo review (POSNext #290 + Nexus_Demo #5)

Studied this together with Nexus_Demo #5 — they share the adjust_roles_of_cachier_and_manager branch and must merge together. This PR provides the data/permission layer (Nexus POS Manager perms on 7 DocTypes + 5 Reports, workspace gating, JSON normalization). Two items need attention.

Blocker (cross-repo)

1. Missing compat module that Nexus_Demo Search should be order-agnostic and support partial matching (Fuzzy Search) #5 imports. nexus_demo's setup_manager_desk() does from pos_next.pos_next.compat.frappe_delete_doc import ensure_delete_doc_linked_helpers on its first line, and that runs on after_install/after_migrate and on every Manager session start. This PR adds pos_next/pos_next/setup/__init__.py but no pos_next/pos_next/compat/ package, so the import raises ImportError and breaks migrate + every Manager demo. Either add the compat/frappe_delete_doc module here, or have Search should be order-agnostic and support partial matching (Fuzzy Search) #5 guard the import. (See the matching note on #5.)

Risk

2. Workspace restriction is a regression for non-demo POSNext installs. posnext.json changes the workspace roles from open ([]) to Nexus POS Manager only. Since this targets develop, on a plain POSNext install (no nexus_demo, no user holding that role) the POSNext workspace disappears for Sales Manager, Cashier, and everyone else. Consider keeping it open, or gating this behind the demo app rather than shipping it to all POSNext users.

   POSNext/pos_next/pos_next/workspace/posnext/posnext.json

   Lines 189 to 192 in e257227

   	"roles": [
   	{
   	"role": "Nexus POS Manager"
   	}

Minor

3. Nexus POS Manager gets delete on POS Coupon / POS Offer / Referral Code and a meaningless create on the POS Settings Single (copied verbatim from Sales Manager) — worth trimming for a demo manager persona.

The JSON normalization, row_format: Dynamic, and referral_code field_order additions look fine. Note the PR description mentions hooks.py/install.py calling setup_manager_desk, but hooks.py is unchanged here and that call lives in Nexus_Demo #5 — the description appears to describe both PRs combined.

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