refactor(memory): address crate 重构——拆分 span、重命名为 memory_types

重构 `crates/address` 为更准确的命名和更清晰的职责划分：

**结构变更：**
- 新建 `crates/span`：提取 `Span<A>` 通用半开区间为独立零依赖 crate
- `crates/address` → `crates/memory_types`：包名更准确反映内容
- `page_num.rs` → `page_frame.rs`：文件名覆盖 Frame 和 Page 两种类型

**类型重命名：**
- `AddrRange<A>` → `Span<A>`（通用术语，参考 Redox PageSpan）
- `FrameRange` → `FrameSpan`，`PageRange` → `PageSpan`
- 删除 `PhysPageNum`/`VirtPageNum` 别名，直接用 `Frame`/`Page`（默认类型参数）

**代码审阅修复：**
- 算术溢出：`debug_assert!` + 裸运算 → `checked_add/sub` + `expect`
- 避免软件除法：乘除法全部替换为位移（`NUM_4K_PAGES_SHIFT`）
- `From<*const T>` 和 `align_up_to` 结果经过 `Self::new()` 校验
- `Frame`/`Page` 加 `#[repr(transparent)]`、`const fn new/start_addr`
- `PageSize` trait：`NUM_4K_PAGES_SHIFT`/`SIZE_IN_BYTES` 改为自动派生
- Display 输出 `Frame<4K>(0x42)` 格式，包含页大小信息
- 删除无用的 `page_size::tests` 模块

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Niu Zhihong <zhihong@nzhnb.com>

Author: MRNIU

Cargo.lock

@@ -13,7 +13,8 @@ members = [
     ".",
     "crates/build_common",
     "crates/config",
-    "crates/address",
+    "crates/span",
+    "crates/memory_types",
     "crates/macros",
     "crates/per_cpu",
     "crates/interrupt_state",
@@ -141,7 +142,7 @@ bench = false
 [dependencies]
 # --- 内部 crate ---
 config = { path = "crates/config" }
-address = { path = "crates/address" }
+memory_types = { path = "crates/memory_types" }
 per_cpu = { path = "crates/per_cpu" }
 interrupt_state = { path = "crates/interrupt_state" }
 sync = { path = "crates/sync" }