feat: self-serve signup Phase 2 (frontend cutover) (#162)

Co-authored-by: Michael Chihlas <michael@resolutionflow.com>
Co-committed-by: Michael Chihlas <michael@resolutionflow.com>

backend/app/schemas/billing.py

@@ -13,6 +13,10 @@ class CheckoutSessionResponse(BaseModel):
     url: str
 
 
+class BillingPortalSessionResponse(BaseModel):
+    url: str
+
+
 class SubscriptionState(BaseModel):
     status: str
     plan: str
@@ -38,3 +42,23 @@ class BillingStateResponse(BaseModel):
     plan_billing: Optional[PlanBillingState]
     plan_limits: Dict[str, Any]
     enabled_features: Dict[str, bool]
+
+
+class PublicPlanResponse(BaseModel):
+    """Public-safe view of a billable plan, used by the marketing /pricing page.
+
+    Sourced from `plan_billing` joined with `plan_limits.max_users` (exposed
+    here as `max_seats`). Always filtered server-side to is_public=True and
+    is_archived=False, so `is_public` is a constant True for any row returned
+    here — included for clarity and forward compatibility.
+    """
+    plan: str
+    display_name: str
+    description: Optional[str] = None
+    monthly_price_cents: Optional[int] = None
+    annual_price_cents: Optional[int] = None
+    max_seats: Optional[int] = None
+    sort_order: int
+    is_public: bool = True
+
+    model_config = {"from_attributes": True}