feat: add ios particle field runtime facade

release/maplibre-particle/ios/Package.swift.template

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+// Replace every <...> placeholder only after a reproducible XCFramework zip exists.
+// The module/product name must remain MapLibre for MLRN compatibility.
+// swift-tools-version: 5.7
+import PackageDescription
+
+let package = Package(
+    name: "MapLibreDistribution",
+    products: [
+        .library(name: "MapLibre", targets: ["MapLibre"]),
+    ],
+    targets: [
+        .binaryTarget(
+            name: "MapLibre",
+            url: "<https://example.invalid/maplibre/MapLibre.dynamic.xcframework.zip>",
+            checksum: "<SHA256_OF_REAL_ZIP>"
+        ),
+    ]
+)

release/maplibre-particle/ios/README.md

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+# MapLibre Particle iOS Binary Distribution 基线
+
+本目录只保存后续独立 distribution repository 所需的可审计模板；不发布二进制、不创建远端仓库，也不改变 MapLibre iOS 上游版本号。
+
+模块和 product 始终为 `MapLibre`。MLRN 11.3.6 与后续 Particle Bridge 必须通过同一份自定义 MapLibre binary 消费，不能再链接第二个同功能但不同模块名的 framework。
+
+发布时：
+
+1. 在 macOS 上从对应 Git commit 成功生成 `MapLibre.dynamic.xcframework`；
+2. 压缩为 `MapLibre.dynamic.xcframework.zip`，对 zip 计算 SHA-256；
+3. 用真实 URL、checksum、commit 和构建记录填充 `release-manifest.json`；
+4. 将相同 URL/checksum 代入 `Package.swift.template`，再在独立 distribution repository 发布。
+
+外部 binary distribution 版本独立于 `platform/ios/VERSION`；首个建议坐标为 `6.28.0-particle.1`。本 Step 尚未取得可发布 XCFramework zip，因此 manifest 保持 `NOT_BUILT`，不提供伪造 hash。

release/maplibre-particle/ios/release-manifest.json

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+{
+  "schemaVersion": 1,
+  "status": "NOT_BUILT",
+  "distributionVersion": "6.28.0-particle.1",
+  "moduleName": "MapLibre",
+  "artifact": {
+    "fileName": "MapLibre.dynamic.xcframework.zip",
+    "url": "NOT_BUILT",
+    "sizeBytes": null,
+    "sha256": "NOT_BUILT"
+  },
+  "sourceCommit": "3e03949d3411c830cfff4bf320cd350f5b6a7527",
+  "notes": "STEP-082 created the template only. Populate artifact fields only from a successful macOS XCFramework build."
+}