Add tiled homepage; rename Business→Businesses; link footer copyright

- Home page (home.html) at / shows the sidebar sections as tiles; reachable by
  clicking the 'SimpleX Manager' brand in the sidebar (was redirecting to /users).
- Rename the category to 'Businesses' (route /businesses, tab/nav/_category),
  keeping the per-account bot_type 'business'. Fix profile back-link label.
- Footer: link 'Bournemouth Technology Ltd' -> bournemouthtechnology.co.uk and
  'SimpleX Network' -> simplex.chat.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

manager/main.py

@@ -71,9 +71,9 @@ def _enrich(profiles: list[dict]) -> list[dict]:
 
 
 def _category(bot_type: str) -> str:
-    """Which sidebar category a profile belongs to: users / business / bots."""
+    """Which sidebar category a profile belongs to: users / businesses / bots."""
     if bot_type in pm.BUSINESS_TYPES:
-        return "business"
+        return "businesses"
     if bot_type in pm.USER_TYPES:
         return "users"
     return "bots"
@@ -106,7 +106,9 @@ async def logout():
 
 @app.get("/", response_class=HTMLResponse)
 async def index(request: Request):
-    return RedirectResponse("/users", status_code=302)
+    if redir := _redirect_if_unauth(request):
+        return redir
+    return TEMPLATES.TemplateResponse(request, "home.html", {"nav_active": "home"})
 
 
 @app.get("/users", response_class=HTMLResponse)
@@ -120,14 +122,14 @@ async def users_page(request: Request):
     })
 
 
-@app.get("/business", response_class=HTMLResponse)
-async def business_page(request: Request):
+@app.get("/businesses", response_class=HTMLResponse)
+async def businesses_page(request: Request):
     if redir := _redirect_if_unauth(request):
         return redir
     items = _enrich([p for p in db.list_profiles() if p["bot_type"] in pm.BUSINESS_TYPES])
     return TEMPLATES.TemplateResponse(request, "list.html", {
-        "tab": "business", "items": items, "create_types": pm.BUSINESS_TYPES,
-        "nav_active": "business",
+        "tab": "businesses", "items": items, "create_types": pm.BUSINESS_TYPES,
+        "nav_active": "businesses",
     })