fix(psa): move CW clientId to server config, remove from user input

ClientId is a product-level GUID registered at developer.connectwise.com,
not per-MSP. Moved to settings.CW_CLIENT_ID env var. MSPs now only
provide site URL, company ID, public key, and private key.

Also added newline handling note to post_note() — CW Developer Guide
states \n is unsupported in JSON bodies. Needs sandbox testing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/account/IntegrationsPage.tsx

@@ -28,7 +28,6 @@ interface ConnectionForm {
   company_id: string
   public_key: string
   private_key: string
-  client_id: string
 }
 
 const emptyForm: ConnectionForm = {
@@ -37,7 +36,6 @@ const emptyForm: ConnectionForm = {
   company_id: '',
   public_key: '',
   private_key: '',
-  client_id: '',
 }
 
 type Tab = 'connection' | 'member-mapping' | 'post-history'
@@ -122,7 +120,7 @@ export function IntegrationsPage() {
       if (form.company_id && form.company_id !== connection.company_id) update.company_id = form.company_id
       if (form.public_key) update.public_key = form.public_key
       if (form.private_key) update.private_key = form.private_key
-      if (form.client_id) update.client_id = form.client_id
+      // client_id is server-side (settings.CW_CLIENT_ID), not per-account
 
       const updated = await integrationsApi.updateConnection(connection.id, update)
       setConnection(updated)
@@ -177,7 +175,6 @@ export function IntegrationsPage() {
       company_id: connection.company_id,
       public_key: '',
       private_key: '',
-      client_id: '',
     })
     setFormError(null)
     setTestResult(null)
@@ -336,20 +333,6 @@ export function IntegrationsPage() {
                   />
                 </div>
 
-                <div>
-                  <label className="font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground">
-                    Client ID
-                  </label>
-                  <Input
-                    type="text"
-                    value={form.client_id}
-                    onChange={(e) => setForm({ ...form, client_id: e.target.value })}
-                    placeholder="ConnectWise Developer Client ID"
-                    required={mode === 'setup'}
-                    className="mt-1"
-                  />
-                </div>
-
                 {formError && (
                   <div className="flex items-center gap-2 rounded-md border border-red-400/20 bg-red-400/10 p-3 text-sm text-red-400">
                     <AlertCircle className="h-4 w-4 shrink-0" />

frontend/src/types/integrations.ts

@@ -20,7 +20,6 @@ export interface PsaConnectionCreate {
   company_id: string
   public_key: string
   private_key: string
-  client_id: string
 }
 
 export interface PsaConnectionUpdate {
@@ -29,7 +28,6 @@ export interface PsaConnectionUpdate {
   company_id?: string
   public_key?: string
   private_key?: string
-  client_id?: string
 }
 
 export interface PsaConnectionTestResponse {