VITEC headless v14: 5-bug fix unifies plugin renderers + cleanup

Resolves a cascade of TYPO3 v14 breaking changes that left every VITEC
plugin's JSON output silently empty:

1. `list_type` column dropped — all renderer page-discovery queries now
   filter by `CType = 'vitec_X'`.
2. `#[AsAllowedCallable]` attribute added to every public render() —
   without it v14 throws AllowedCallableException, which headless
   silently filters via its "Oops, an error occurred!" guard.
3. `$GLOBALS['TSFE']->id` is null inside JSON cObj context — page id
   now read from the `frontend.page.information` request attribute
   (TSFE fallback kept for legacy entry points).
4. page.tsconfig wizard items migrated to `CType = vitec_X` directly
   (legacy `CType=list, list_type=...` no longer exists in v14).
5. ContainerChildrenProcessor + ContentElementResolver dispatch the
   PLUGIN_RENDERERS map by CType (primary) with list_type fallback.

Beyond the bug fix this commit also contains:
- Datasheets renderer rewritten to "products with newest datasheet"
  semantics (filtered via Download.hideondatasheets).
- New vitec/card content block — multi-purpose card with backend
  preview and layout/background/aspect/alignment/border/shadow options.
- New vitec_container CType (b13 single-column container, FlexForm
  cssClass propagated into the JSON envelope).
- ContentElementResolver service for contentelement/contentelementcta
  link resolution; ContainerChildrenProcessor for nested plugin
  resolution inside b13 containers.
- Vitecset setup.typoscript: ContentElement import moved to top so
  lib.contentElement is defined before VITEC's tt_content blocks.
- Cleanup: 98 .bak.<timestamp> debugging backups removed; *.bak.* and
  /public/_assets_install/ added to .gitignore.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/vitec/ContentBlocks/ContentElements/card/config.yaml

@@ -0,0 +1,186 @@
+name: vitec/card
+group: vitec
+prefixFields: true
+prefixType: vendor
+
+fields:
+  # ──────────────────────────────────────────────────────────────────────
+  - identifier: tab_content
+    type: Tab
+    label: Content
+
+  - identifier: eyebrow
+    type: Text
+    max: 50
+
+  - identifier: header
+    useExistingField: true
+    required: true
+
+  - identifier: subheader
+    useExistingField: true
+
+  - identifier: bodytext
+    useExistingField: true
+    enableRichtext: true
+
+  - identifier: image
+    type: File
+    minitems: 0
+    maxitems: 1
+    allowed: common-image-types
+
+  - identifier: icon
+    type: File
+    minitems: 0
+    maxitems: 1
+    allowed: svg,png
+
+  - identifier: primary_cta
+    type: Link
+    allowedTypes:
+      - page
+      - url
+      - file
+      - email
+
+  - identifier: primary_cta_label
+    type: Text
+    max: 30
+    default: 'Learn more'
+
+  - identifier: secondary_cta
+    type: Link
+    allowedTypes:
+      - page
+      - url
+      - file
+      - email
+
+  - identifier: secondary_cta_label
+    type: Text
+    max: 30
+
+  - identifier: card_link
+    type: Link
+    allowedTypes:
+      - page
+      - url
+      - file
+      - email
+
+  # ──────────────────────────────────────────────────────────────────────
+  - identifier: tab_layout
+    type: Tab
+    label: Layout
+
+  - identifier: layout_variant
+    type: Select
+    renderType: selectSingle
+    default: vertical
+    items:
+      - label: Vertical (image top, content below)
+        value: vertical
+      - label: Horizontal (image left, content right)
+        value: horizontal
+      - label: Horizontal Reverse (content left, image right)
+        value: horizontal_reverse
+      - label: Image Overlay (text over image)
+        value: image_overlay
+      - label: Text Only (no image)
+        value: text_only
+      - label: Icon Card (icon focused, text below)
+        value: icon_card
+      - label: Feature (large highlighted card)
+        value: feature
+      - label: Compact (small card, tight spacing)
+        value: compact
+
+  - identifier: background_variant
+    type: Select
+    renderType: selectSingle
+    default: none
+    items:
+      - label: None
+        value: none
+      - label: Orange
+        value: orange
+      - label: Blue
+        value: blue
+      - label: Graphite
+        value: graphite
+      - label: Midnight
+        value: midnight
+      - label: Light (neutral)
+        value: light
+      - label: Dark (neutral)
+        value: dark
+
+  - identifier: image_aspect_ratio
+    type: Select
+    renderType: selectSingle
+    default: auto
+    items:
+      - label: Auto (original)
+        value: auto
+      - label: Square (1:1)
+        value: '1_1'
+      - label: Landscape (4:3)
+        value: '4_3'
+      - label: Widescreen (16:9)
+        value: '16_9'
+      - label: Portrait (3:4)
+        value: '3_4'
+
+  - identifier: text_alignment
+    type: Select
+    renderType: selectSingle
+    default: left
+    items:
+      - label: Left
+        value: left
+      - label: Center
+        value: center
+      - label: Right
+        value: right
+
+  - identifier: border_style
+    type: Select
+    renderType: selectSingle
+    default: none
+    items:
+      - label: None
+        value: none
+      - label: Soft (subtle line)
+        value: soft
+      - label: Hard (thick line)
+        value: hard
+      - label: Dashed
+        value: dashed
+
+  - identifier: shadow
+    type: Select
+    renderType: selectSingle
+    default: none
+    items:
+      - label: None
+        value: none
+      - label: Soft
+        value: soft
+      - label: Medium
+        value: medium
+      - label: Strong
+        value: strong
+
+  # ──────────────────────────────────────────────────────────────────────
+  - identifier: tab_advanced
+    type: Tab
+    label: Advanced
+
+  - identifier: cssClass
+    type: Text
+    max: 100
+
+  - identifier: debug
+    type: Checkbox
+    default: 0