fix(site): Add server side validation for new site and server

[shadrak98]

Earlier this validation was only on client side for teams on unpaid invoice, it will now check on server side as well.

[greptile-apps]

Confidence Score: 3/5

Not safe to merge until the parent-team regression and outstanding cancelled-invoice counting issue are fixed.

_{Reviews (2) · Last reviewed commit: "fix(team): Check spending limit in serve..."}

[greptile-apps]

Cancelled invoices block creation

Cancellation sets docstatus to 2 without changing an invoice's Unpaid status. This count therefore includes cancelled invoices, so two cancelled invoices—or one cancelled and one current invoice—can incorrectly block site and server creation.

Suggested change

	frappe.db.count("Invoice", {"team": self.name, "status": "Unpaid", "type": "Subscription"}) >= 2
	frappe.db.count(
	"Invoice",
	{"team": self.name, "status": "Unpaid", "type": "Subscription", "docstatus": ("<", 2)},
	)
	>= 2

Prompt To Fix With AI

This is a comment left during a code review.
Path: press/press/doctype/team/team.py
Line: 817

Comment:
**Cancelled invoices block creation**

Cancellation sets `docstatus` to 2 without changing an invoice's `Unpaid` status. This count therefore includes cancelled invoices, so two cancelled invoices—or one cancelled and one current invoice—can incorrectly block site and server creation.

```suggestion
			frappe.db.count(
				"Invoice",
				{"team": self.name, "status": "Unpaid", "type": "Subscription", "docstatus": ("<", 2)},
			)
			>= 2
```

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.02%. Comparing base (07485b0) to head (faf67df).
⚠️ Report is 18 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7455      +/-   ##
===========================================
+ Coverage    61.94%   62.02%   +0.07%     
===========================================
  Files         1067     1067              
  Lines       102449   102569     +120     
  Branches      1777     1779       +2     
===========================================
+ Hits         63460    63615     +155     
+ Misses       38944    38909      -35     
  Partials        45       45              

Flag	Coverage Δ
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[greptile-apps]

Child Teams Lose Exemption

Invited child teams have apply_limits enabled by default, but this limit check runs before the parent_team exemption. Once a child team reaches its spending limit, it is incorrectly blocked from creating sites despite the existing exemption.

Prompt To Fix With AI

This is a comment left during a code review.
Path: press/press/doctype/team/team.py
Line: 1320-1322

Comment:
**Child Teams Lose Exemption**

Invited child teams have `apply_limits` enabled by default, but this limit check runs before the `parent_team` exemption. Once a child team reaches its spending limit, it is incorrectly blocked from creating sites despite the existing exemption.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.