Refactor Nexus One AI product structure and roadmap

- Add Workstation as an additive standalone category, kept out of
  TIER_ORDER so it never enters the Server S/M/L/Max upgrade ladder
- Add Server S/M/L/Max commercial labels for existing starter/basic/pro/max
  tiers (slugs, license format, and APIs unchanged)
- Rename portal UI terminology: Connectors -> MCP & Enterprise Connectors,
  Audit Log -> Governance & Audit, Model Manager -> Model Catalog,
  Agent Builder -> Agent Studio, Workflow Automation -> Workflow Designer,
  Multimodal Chat -> AI Workspace
- Fix branding.js workflow.html tier-gating bug and entry.yml missing tier var
- Document 7-capability platform roadmap and Workstation/Server structure
  in README.md and docs/README.md
- Ignore __pycache__/*.pyc build artifacts

cezen-portal/branding.js

@@ -37,15 +37,17 @@
     'schedules.html':     'pro',
     'teams.html':         'pro',
     'training.html':      'pro',
-    'workflow.html':      'pro',
+    'workflows.html':     'pro',
   };
 
-  // Human-readable tier names for the upgrade prompt
+  // Human-readable tier names for the upgrade prompt (Server S/M/L/Max are the
+  // commercial labels for the same starter/basic/pro/max ranks used above —
+  // slugs and TIER_RANK are unchanged for backward compatibility).
   var TIER_NAMES = {
-    starter: 'Starter',
-    basic:   'Basic',
-    pro:     'Pro',
-    max:     'Max',
+    starter: 'Server S',
+    basic:   'Server M',
+    pro:     'Server L',
+    max:     'Server Max',
   };
 
   var SERVICE_PORTS = {