feat(core): 补全剩余 6 个 StreamField Block (ProductCard/Pricing/Timeline/Team/TechStack/Video)

- apps/core/blocks.py 新增 ProductCardBlock/PricingBlock/TimelineBlock/TeamBlock/TechStackBlock/VideoBlock，COMMON_BLOCKS 扩充至 14 个内容 Block
- TeamBlock 新增 TeamMemberChooserBlock(SnippetChooserBlock)，复用 FormBlock 已有的 get_api_representation 展开模式，展开 TeamMember 完整字段（含 serialize_image 复用）
- 为 blog/cases/home/products/solutions 五个 Page 模型生成并应用 alter field body 迁移（StreamField block 定义变更会写入迁移 state）
- apps/core/tests.py 新增 TeamMemberChooserBlock 空值/展开单元测试，pytest 33 个用例全部通过
- 设计文档 §2.6/§2.16 同步更新为已实现

apps/core/blocks.py

@@ -7,6 +7,8 @@ from wagtail import blocks
 from wagtail.images.blocks import ImageChooserBlock
 from wagtail.snippets.blocks import SnippetChooserBlock
 
+from .serializers import serialize_image
+
 
 class CTAButtonBlock(blocks.StructBlock):
     text = blocks.CharBlock(max_length=50, label=_("按钮文案"))
@@ -150,6 +152,113 @@ class FormBlock(blocks.StructBlock):
         }
 
 
+class ProductCardItemBlock(blocks.StructBlock):
+    title = blocks.CharBlock(max_length=100, label=_("标题"))
+    description = blocks.TextBlock(required=False, label=_("描述"))
+    image = ImageChooserBlock(required=False, label=_("图片"))
+    link = blocks.URLBlock(required=False, label=_("链接"))
+
+
+class ProductCardBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
+    items = blocks.ListBlock(ProductCardItemBlock(), label=_("产品列表"))
+
+    class Meta:
+        icon = "grip"
+        label = _("产品矩阵")
+
+
+class PricingPlanBlock(blocks.StructBlock):
+    name = blocks.CharBlock(max_length=50, label=_("方案名称"))
+    price = blocks.CharBlock(max_length=50, label=_("价格"))
+    features = blocks.ListBlock(
+        blocks.CharBlock(max_length=100), label=_("功能列表")
+    )
+    highlighted = blocks.BooleanBlock(
+        required=False, default=False, label=_("突出显示")
+    )
+    button = CTAButtonBlock(required=False, label=_("按钮"))
+
+
+class PricingBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
+    plans = blocks.ListBlock(PricingPlanBlock(), label=_("定价方案"))
+
+    class Meta:
+        icon = "tag"
+        label = _("定价")
+
+
+class TimelineItemBlock(blocks.StructBlock):
+    year = blocks.CharBlock(max_length=20, label=_("年份/时间"))
+    event = blocks.TextBlock(label=_("事件描述"))
+
+
+class TimelineBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
+    items = blocks.ListBlock(TimelineItemBlock(), label=_("时间线条目"))
+
+    class Meta:
+        icon = "date"
+        label = _("发展历程")
+
+
+class TeamMemberChooserBlock(SnippetChooserBlock):
+    """选择 apps.core.TeamMember Snippet，展开完整字段供前端渲染（而非仅主键）。"""
+
+    def __init__(self, **kwargs):
+        super().__init__("core.TeamMember", **kwargs)
+
+    def get_api_representation(self, value, context=None):
+        if value is None:
+            return None
+        return {
+            "id": value.pk,
+            "name": value.name,
+            "role": value.role,
+            "bio": value.bio,
+            "photo": serialize_image(value.photo),
+        }
+
+
+class TeamBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
+    members = blocks.ListBlock(TeamMemberChooserBlock(), label=_("团队成员"))
+
+    class Meta:
+        icon = "group"
+        label = _("团队展示")
+
+
+class TechStackItemBlock(blocks.StructBlock):
+    icon = blocks.CharBlock(max_length=50, required=False, label=_("图标"))
+    label = blocks.CharBlock(max_length=50, label=_("名称"))
+
+
+class TechStackBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
+    items = blocks.ListBlock(TechStackItemBlock(), label=_("技术项"))
+
+    class Meta:
+        icon = "cogs"
+        label = _("技术架构")
+
+
+class VideoBlock(blocks.StructBlock):
+    heading = blocks.CharBlock(max_length=100, required=False, label=_("标题"))
+    video_url = blocks.URLBlock(
+        label=_("视频地址"),
+        help_text=_(
+            "建议使用自建 OSS/COS 存储的 mp4 直链，或腾讯视频/哔哩哔哩等国内平台的"
+            "嵌入地址，避免使用 YouTube/Vimeo（详见 §2.15 国内可访问性要求）"
+        ),
+    )
+    poster = ImageChooserBlock(required=False, label=_("封面图"))
+
+    class Meta:
+        icon = "media"
+        label = _("视频")
+
 
 COMMON_BLOCKS = [
     ("hero", HeroBlock()),
@@ -160,5 +269,11 @@ COMMON_BLOCKS = [
     ("logo_cloud", LogoCloudBlock()),
     ("case_study", CaseStudyBlock()),
     ("form", FormBlock()),
+    ("product_card", ProductCardBlock()),
+    ("pricing", PricingBlock()),
+    ("timeline", TimelineBlock()),
+    ("team", TeamBlock()),
+    ("tech_stack", TechStackBlock()),
+    ("video", VideoBlock()),
     ("richtext", blocks.RichTextBlock(label=_("富文本"))),
 ]