perf(motion): 第三批入场动效时长收敛至 300ms（9 文件 20 处）

承接前两批，继续清理 Task #16 的 P0 硬违规：

- brand-content (1) / methodology-content (3) / products-content-v3 (4) /
  solution-detail-content-v3 (4) / team-content-v3 (1) / detail-product-value (2) /
  service-value (1) / solution-value (3) / brand-visuals 入场处 (1)
- 审计：P0 33 → 13，P1 163 / P2 28 持平
- 只改 duration，保留原 delay（与首批先例一致）

验证：
- tsc --noEmit 0 error；eslint 9 文件 0 error（仅 methodology 既有 `any` 警告，非本次引入）
- 视觉基线不变：前两批已证明时长改动在 reducedMotion+animations disabled 下不改变最终像素

剩余 13 处 P0 均为决策点，未在本批处理：
- 3 处循环动画（detail-hero ×2、brand-visuals ×1，repeat:Infinity，违反「禁循环动画」）
- 10 处死代码（src/lib/animations.tsx，全站零引用）

src/components/detail/detail-product-value.tsx

@@ -118,7 +118,7 @@ export function ProductValueSection({ product }: ProductValueSectionProps) {
           initial={{ opacity: 0, y: 32 }}
           whileInView={{ opacity: 1, y: 0 }}
           viewport={{ once: true, margin: '-120px' }}
-          transition={{ duration: 0.8, ease: [0.22, 1, 0.36, 1] }}
+          transition={{ duration: 0.3, ease: [0.22, 1, 0.36, 1] }}
           className="mb-16 sm:mb-20"
         >
           <div className="flex items-center gap-3 mb-6">
@@ -243,7 +243,7 @@ export function ProductValueSection({ product }: ProductValueSectionProps) {
             initial={{ opacity: 0, y: 32 }}
             whileInView={{ opacity: 1, y: 0 }}
             viewport={{ once: true, margin: '-80px' }}
-            transition={{ duration: 0.75, delay: 0.2 }}
+            transition={{ duration: 0.3, delay: 0.2 }}
             className="mt-24"
           >
             <div className="mb-12">

src/components/detail/service-value.tsx

@@ -26,7 +26,7 @@ export function ServiceValueSection({ service }: ServiceValueSectionProps) {
           initial={{ opacity: 0, y: 32 }}
           whileInView={{ opacity: 1, y: 0 }}
           viewport={{ once: true, margin: '-120px' }}
-          transition={{ duration: 0.8, ease: [0.22, 1, 0.36, 1] }}
+          transition={{ duration: 0.3, ease: [0.22, 1, 0.36, 1] }}
           className="mb-16 sm:mb-20"
         >
           <div className="flex items-center gap-3 mb-6">

src/components/detail/solution-value.tsx

@@ -21,7 +21,7 @@ export function SolutionValueSection({ solution }: SolutionValueSectionProps) {
           initial={{ opacity: 0, y: 32 }}
           whileInView={{ opacity: 1, y: 0 }}
           viewport={{ once: true, margin: '-120px' }}
-          transition={{ duration: 0.8, ease: [0.22, 1, 0.36, 1] }}
+          transition={{ duration: 0.3, ease: [0.22, 1, 0.36, 1] }}
           className="mb-16 sm:mb-20"
         >
           <div className="flex items-center gap-3 mb-6">
@@ -119,7 +119,7 @@ export function SolutionValueSection({ solution }: SolutionValueSectionProps) {
             initial={{ opacity: 0, y: 32 }}
             whileInView={{ opacity: 1, y: 0 }}
             viewport={{ once: true, margin: '-80px' }}
-            transition={{ duration: 0.75, delay: 0.3 }}
+            transition={{ duration: 0.3, delay: 0.3 }}
           >
             <div className="mb-12">
               <div className="flex items-center gap-3 mb-6">
@@ -164,7 +164,7 @@ export function SolutionValueSection({ solution }: SolutionValueSectionProps) {
             initial={{ opacity: 0, y: 32 }}
             whileInView={{ opacity: 1, y: 0 }}
             viewport={{ once: true, margin: '-80px' }}
-            transition={{ duration: 0.75, delay: 0.4 }}
+            transition={{ duration: 0.3, delay: 0.4 }}
             className="mt-20"
           >
             <div className="mb-12">