paged headers: self-include <cstddef>/<cstdint> for size_t/uintN_t (fix amd64/non-arm64 build; compile-only)

Vendored paged headers used size_t / uintN_t without including <cstddef> /
<cstdint>. The arm64 DGX toolchain provides them transitively so the build
passed there, but amd64/older toolchains do not, failing the CI amd64 build one
header at a time ('size_t' does not name a type -> cascade).

paged-kv-manager.h was already fixed. This adds the missing includes to the
remaining vendored headers at the point each is created/rewritten in the patch
series so every src/paged*.h self-includes both:

  * paged-attn.h     (0003): add <cstddef> (had <cstdint>)
  * paged-alloc.h    (0007): add <cstddef> (had <cstdint>)
  * paged-prefix-api.h (0007): add <cstddef> + <cstdint> (had only llama.h)

The .cpp units include their own paged header, so they inherit the includes
transitively. Whole series still applies clean on the pinned llama.cpp.

Compile-only change: no runtime behavior change, bit-exactness unaffected.

Assisted-by: Claude:opus-4.8 [Claude Code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

backend/cpp/llama-cpp-localai-paged/patches/paged/0003-paged-gather-read-env-LLAMA_KV_PAGED.patch

@@ -323,7 +323,7 @@ new file mode 100644
 index 0000000..c5b7bd7
 --- /dev/null
 +++ b/src/paged-attn.h
-@@ -0,0 +1,40 @@
+@@ -0,0 +1,41 @@
 +#pragma once
 +// Paged attention gather-read (patch 0003, experimental).
 +//
@@ -341,6 +341,7 @@ index 0000000..c5b7bd7
 +// All logic lives here to keep the core files additive: build_attn gets one
 +// call, llama_kv_cache_context gets two thin accessors, CMake gets one line.
 +
++#include <cstddef>
 +#include <cstdint>
 +
 +struct ggml_context;

backend/cpp/llama-cpp-localai-paged/patches/paged/0007-paged-engine-prefix-recompute-skip-env-LLAMA_KV_PAGED.patch

@@ -350,7 +350,7 @@ diff --git a/src/paged-alloc.h b/src/paged-alloc.h
 index bf66665..88dedef 100644
 --- a/src/paged-alloc.h
 +++ b/src/paged-alloc.h
-@@ -1,17 +1,27 @@
+@@ -1,17 +1,28 @@
  #pragma once
 -// On-demand paged KV block allocation (patch 0004, experimental).
 +// On-demand paged KV block allocation + cross-request prefix reuse
@@ -387,6 +387,7 @@ index bf66665..88dedef 100644
 +// registry), so the core kv-cache struct stays untouched - find_slot gains only
 +// gated calls. Gated behind env LLAMA_KV_PAGED; a no-op when unset.
  
++#include <cstddef>
  #include <cstdint>
  #include <vector>
 @@ -21,19 +31,42 @@ namespace paged_alloc {
@@ -498,7 +499,7 @@ new file mode 100644
 index 0000000..78a3864
 --- /dev/null
 +++ b/src/paged-prefix-api.h
-@@ -0,0 +1,27 @@
+@@ -0,0 +1,29 @@
 +#pragma once
 +// Thin test/diagnostic shim over the paged cross-request prefix engine seam
 +// (patch 0007). Lets a driver that only includes the public llama.h reach the
@@ -506,6 +507,8 @@ index 0000000..78a3864
 +// without pulling in the internal kv-cache headers. All entry points are no-ops
 +// (return 0) unless env LLAMA_KV_PAGED is set. Experimental; not a stable API.
 +
++#include <cstddef>
++#include <cstdint>
 +#include "llama.h"
 +
 +namespace paged_prefix_api {