refactor(edge): adapters SDK 适配器归组子包（#1760 首个增量）

[DeliciousBuding]

Summary

#1760 的首个有界增量：把 edge-server/internal/adapters（原 81 个平铺 .go 文件）中内聚的直连 HTTP SDK 适配器归组到新子包 internal/adapters/sdk/，根包降至 69 个文件（-12），降低认知负载。纯重组，无行为变化。

迁移了什么（12 个文件 → adapters/sdk，另拆分 1 个测试文件）

• anthropic_sdk{,_request,_sse,_types,_e2e_test}.go（5）
• openai_sdk{,_request,_sse,_types,_e2e_test}.go（5）
• sdk_common{,_test}.go（BuildCommand 哨兵命令助手，2）
• adapter_latency_test.go 的 SDK 延迟基准/测试随适配器迁入 sdk/adapter_latency_test.go；BenchmarkClassifyComplexity（router 相关）留在根包
• 新增 sdk/doc.go、sdk/aliases.go（合同类型与用到的 BusEvent* 常量派生自 internal/orchestration，模式对齐既有叶子包 adapters/orchestrator）
• 组合根 cmd/agenthub-edge/adapter_registry.go 改为 import .../adapters/sdk（sdk.NewAnthropicSDKAdapter / sdk.NewOpenAISDKAdapter / sdk.AnthropicHTTPTimeout / sdk.OpenAIHTTPTimeout）

为什么无环（先分析后动手，go list -deps 机器验证）

• 依赖方向单向：sdk → adapters（ResolveModel、ResolveReasoningEffort、CtxRunContext、NewNonRecoverableParseError、SDKAdapterContext 仍留在根包）+ sdk → orchestration（合同 SSOT）；go list -deps ./internal/adapters 确认根包不含 adapters/sdk。
• 根包归组后不再引用任何 SDK 符号：registry.go 只含字符串适配器 ID（"anthropic-sdk"/"openai-sdk"），构造函数调用点只在组合根；原根包内唯一引用 SDK 符号的 adapter_latency_test.go（内部测试，使用未导出的 buildMessages）已随迁，避免测试图成环。
• 无需在根包加 re-export：仓库内没有任何其它包经由 adapters.* 引用 SDK 符号。

剩余耦合（本增量刻意不碰）

sdk_fixture_mapper*.go（5 个文件）暂不归组：与根包双向耦合——mapper 使用根包 BusEvent* 常量，而根包生产代码 agentspec_fixture.go 构造 SDKFixture* 类型并调用 NewClaudeCodeAdapter/NewCodexACPadapter/NewOpenCodeACPAdapter 等其他适配器构造函数；整体下沉会形成 import cycle。后续增量可先把 AgentSpec 编译器与 fixture mapper 一起解耦再归组。

Verification（全部通过）

cd edge-server && go build ./... && go vet ./... && go test ./internal/adapters/... -short

• go build ./... ✅
• go vet ./... ✅
• go test ./internal/adapters/... -short ✅（adapters、adapters/orchestrator、adapters/sdk 均 ok）
• 额外：go test ./cmd/... ./internal/lifecycle/... -short ✅；scripts/verify/verify-orchestrator-deps.py 3/3 PASS（依赖方向门禁不受影响）；gofmt -l 干净

Test plan

• go build ./... / go vet ./... / go test ./internal/adapters/... -short 全绿
• go list -deps 确认 adapters ↛ adapters/sdk（单向无环）
• 组合根与 lifecycle 测试通过
• CI 全量回归

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📥 Commits

Reviewing files that changed from the base of the PR and between de446df and e78d2de.

📒 Files selected for processing (17)

• edge-server/cmd/agenthub-edge/adapter_registry.go
• edge-server/internal/adapters/adapter_latency_test.go
• edge-server/internal/adapters/sdk/adapter_latency_test.go
• edge-server/internal/adapters/sdk/aliases.go
• edge-server/internal/adapters/sdk/anthropic_sdk.go
• edge-server/internal/adapters/sdk/anthropic_sdk_e2e_test.go
• edge-server/internal/adapters/sdk/anthropic_sdk_request.go
• edge-server/internal/adapters/sdk/anthropic_sdk_sse.go
• edge-server/internal/adapters/sdk/anthropic_sdk_types.go
• edge-server/internal/adapters/sdk/doc.go
• edge-server/internal/adapters/sdk/openai_sdk.go
• edge-server/internal/adapters/sdk/openai_sdk_e2e_test.go
• edge-server/internal/adapters/sdk/openai_sdk_request.go
• edge-server/internal/adapters/sdk/openai_sdk_sse.go
• edge-server/internal/adapters/sdk/openai_sdk_types.go
• edge-server/internal/adapters/sdk/sdk_common.go
• edge-server/internal/adapters/sdk/sdk_common_test.go

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