chore(branding): remove leftover upstream theme identifiers

The theme was renamed Zibll/子比 → AKSRT → Jio, but upstream branding
survived the sweeps in CSS classes, the SVG sprite prefix, a persisted
widget field ID, JS events, admin Vue class names, test infrastructure
and docblocks.

Renames:
- zib-widget / zib-widget-wrap / zib-slider → jio-widget-box /
  jio-widget-box-wrap / jio-slider-box (jio-widget is taken by the modern
  widget shell, jio-box-* by the card primitives)
- zib-partners-scroll + zps-* → jio-partners-scroll + jps-*
- zib-combo-info-card + zci-* → jio-combo-info-card + jci-*
- zibsvg- → jiosvg-, including the exported picker helpers and the
  fa-zibsvg- family-prefix guard
- zibpay_type → pay_type; the dual-read fallback in PostQuery collapses
  to a single key
- [zibajax="submit"] dropped (no PHP emitter); zib_ajax.success →
  jio_ajax.success
- aks-* admin Vue classes → jio-*
- zib_palette() → palette()

User-facing vendor traces are gone: the floating "more" button default no
longer ships a zibll.com link or 子比主题 marketing copy, the notice
widget ships no preset promo entries, and the four 官网教程 links are
removed from the post-list admin schema.

Test infrastructure renamed to neutral names (docker-compose.reference.yml,
Caddyfile, article-baseline.json, modern-widgets-contract.test.cjs) with
their DB/volume/env/slug identifiers following.

Kept intentionally, documented in tests/fixtures/README.md: the golden
fixture reference fingerprint (a SHA-256 record of an external directory,
read by validate-widget-golden / generate-widget-golden-fixture /
audit-widget-system), the doesNotMatch guards that prove the old tokens are
gone, and the reference theme's own meta key in the visual fixtures.

No backward-compat or data migration: saved widget configs holding old
icon keys or the old field ID silently lose them, per the project's
rewrite-over-compatibility rule.

Verified: 132/132 node contract tests, php tests/widget-system/run.php
(146 assertions), audit-admin-contracts, audit-psr4-paths and
validate-widget-golden all green; tracked bundles regenerated and in sync.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/fixtures/README.md

@@ -0,0 +1,17 @@
+# Fixtures
+
+## `widget-golden-v1.json`
+
+The `reference` block (`source_root`, `fingerprint`, `files`) is an intentional
+fingerprint of an **external** reference-theme checkout on the machine that
+generated the fixture. Its keys and paths describe files in that external
+directory, not identifiers of this theme, and `tools/validate-widget-golden.php`,
+`tools/generate-widget-golden-fixture.php`, and `tools/audit-widget-system.php`
+resolve `source_root` + relative path and compare SHA-256. Changing any of it
+produces `Reference drift` and breaks those audits — leave it verbatim, including
+when the upstream names look out of place.
+
+## `page-visual-matrix-v1.json`
+
+Page-level capture routes for `tools/wp-cli-visual-fixtures.php`. The route paths
+carry the tool's `$fixture_prefix`, so the two must be changed together.

tests/fixtures/page-visual-matrix-v1.json

@@ -12,11 +12,11 @@
   "routes": [
     {"id": "home", "path": "/", "states": ["default", "hover", "loading", "error"]},
     {"id": "archive", "path": "/?post_type=post", "states": ["default", "numbered", "load-more", "infinite"]},
-    {"id": "category", "path": "/category/jio_zibll_v1_101/", "states": ["default", "empty"]},
-    {"id": "tag", "path": "/tag/jio_zibll_v1_103/", "states": ["default", "empty"]},
+    {"id": "category", "path": "/category/jio_visual_v1_101/", "states": ["default", "empty"]},
+    {"id": "tag", "path": "/tag/jio_visual_v1_103/", "states": ["default", "empty"]},
     {"id": "search", "path": "/?s=Jio", "states": ["default", "empty", "focus"]},
-    {"id": "single", "path": "/jio_zibll_v1_301/", "states": ["default", "hover", "toc-open"]},
-    {"id": "resource", "path": "/jio_zibll_v1_303/", "states": ["locked", "authorized", "download"]},
+    {"id": "single", "path": "/jio_visual_v1_301/", "states": ["default", "hover", "toc-open"]},
+    {"id": "resource", "path": "/jio_visual_v1_303/", "states": ["locked", "authorized", "download"]},
     {"id": "page", "path": "/sample-page/", "states": ["default"]},
     {"id": "login", "path": "/wp-login.php", "states": ["default", "focus", "error"]},
     {"id": "user", "path": "/user/", "states": ["guest", "member", "vip"]},

tests/fixtures/widget-golden-v1.json

@@ -2619,7 +2619,7 @@
                 "layout_bg",
                 "load_mode",
                 "cat",
-                "zibpay_type",
+                "pay_type",
                 "limit_day",
                 "orderby",
                 "order",
@@ -2692,7 +2692,7 @@
                 },
                 "load_mode": "ajax",
                 "cat": "1",
-                "zibpay_type": [],
+                "pay_type": [],
                 "limit_day": 0,
                 "orderby": "",
                 "order": "desc",
@@ -2813,7 +2813,7 @@
                     {
                         "title": "Jio · Tab posts",
                         "cat": "1",
-                        "zibpay_type": [],
+                        "pay_type": [],
                         "limit_day": 0,
                         "orderby": "",
                         "order": "desc"
@@ -2821,7 +2821,7 @@
                     {
                         "title": "Jio · Tab posts",
                         "cat": "2",
-                        "zibpay_type": [],
+                        "pay_type": [],
                         "limit_day": 0,
                         "orderby": "",
                         "order": "desc"
@@ -2829,7 +2829,7 @@
                     {
                         "title": "Jio · Tab posts",
                         "cat": "3",
-                        "zibpay_type": [],
+                        "pay_type": [],
                         "limit_day": 0,
                         "orderby": "",
                         "order": "desc"
@@ -2875,7 +2875,7 @@
                 "layout_pin_m",
                 "layout_bg",
                 "cat",
-                "zibpay_type",
+                "pay_type",
                 "orderby",
                 "order",
                 "style",
@@ -2943,7 +2943,7 @@
                     }
                 },
                 "cat": "1",
-                "zibpay_type": [],
+                "pay_type": [],
                 "orderby": "",
                 "order": "desc",
                 "style": "card",