docs: record the Meta App Live-mode gate found during live testing

Code 100 / subcode 1885183 stopped the connection test after nine
consecutive field-mapping fixes, and it is not one: "Ads creative post was
created by an app that is in development mode. It must be in public to
create this ad." Decoded the access token via /debug_token to confirm
which app — MaskanXAds Integration, id 1592299622228272 — rather than
guess. Toggling it to Live on developers.facebook.com is the only fix;
nothing in MaskanX can do this on the user's behalf.

Documented next to the payment-method gate it sits beside in the setup
guide.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/CAMPAIGN_MANAGEMENT_GUIDE.md

@@ -84,11 +84,26 @@ Your current values, for reference:
 - Ad account: `act_1015759234692676` (Maskan-MetaAds, INR)
 - Page: `1229386810259840` (Maskan Technologies Private Limited)
 
-**One thing is still missing on the Meta side:** the ad account has no
+**Two things are still missing on the Meta side, and neither can be fixed
-payment method. MaskanX will let you build, approve and sync a campaign,
+from MaskanX:**
-but **Launch is refused** until you add one — the Marketing API cannot
+
-create funding instruments, so it must be done in Meta Business Manager.
+1. **No payment method on the ad account.** MaskanX will let you build,
-The Campaigns page shows a warning while this is the case.
+   approve and sync a campaign, but **Launch is refused** until you add
+   one in Meta Business Manager — the Marketing API cannot create funding
+   instruments. The Campaigns page shows a warning while this is the case.
+
+2. **The Meta App is in Development mode.** Every access token belongs to
+   a Meta App — yours is **MaskanXAds Integration**, app id
+   `1592299622228272`. An app in Development mode cannot create ad
+   creatives the public can see, and sync fails with code 100 / subcode
+   1885183: *"Ads creative post was created by an app that is in
+   development mode. It must be in public to create this ad."* Fix:
+   https://developers.facebook.com/apps/1592299622228272/settings/basic/
+   → toggle **Development → Live** at the top of the dashboard. Meta may
+   first ask for Basic Settings (Privacy Policy URL, icon, category) and
+   Business Verification before it allows the switch.
+   (To find this id for a different token: `GET /debug_token?input_token=<token>`
+   returns `app_id` — MaskanX has no chat command for this yet.)
 
 ### 1.3 Operator token