chore(paged): keep patches/ patch-only; README to backend root, docs to docs/

The llama-cpp-localai-paged patches/ dir had accumulated docs, plots, a csv,
dev .cpp harnesses, and a dead FP4-MoE kernel scaffold after an earlier git-mv.
Restore the invariant that patches/ holds only the .patch series.

Moves:
- patches/paged/README.md -> README.md (canonical doc at the backend root)
- patches/paged/{PIN_SYNC_c299a92c,PAGED_BITEXACT_NOTE,LOCALAI_LLAMACPP_BACKEND_PLAN,UPSTREAM_LAYER2_SCOPE}.md,
  final_benchmark.csv, qwen36_*.png, paged-burst-bench.cpp, paged-reclaim-unit.cpp -> docs/
- patches/README.md -> docs/PATCH_MAINTENANCE.md (unique patch-regen recipe not in the canonical README)

Deletes:
- patches/BENCHMARKS.md (superseded by README section 4 + the dev-notes section)
- patches/kernel/ (dead FP4-MoE scaffold, never in the 0001-0030 apply glob, zero refs repo-wide)

Repoint every reference to the moved files: README internal links (docs/ + the
.github links drop from 5x ../ to 3x ../), .agents/llama-cpp-localai-paged-backend.md,
.github/scripts/paged-canary-apply.sh, .github/workflows/llama-cpp-paged-canary.yml,
the wrapper Makefile, backend/cpp/llama-cpp/grpc-server.cpp, backend/index.yaml,
docs/content/features/backends.md, gallery/index.yaml.

The build apply glob PAGED_PATCHES_DIR/0*.patch (PAGED_PATCHES_DIR := .../patches/paged)
is unchanged and still resolves to the 28 patches.

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

backend/cpp/llama-cpp/grpc-server.cpp

@@ -850,7 +850,7 @@ static void params_parse(server_context& /*ctx_server*/, const backend::ModelOpt
         // common_context_params_to_llama (patch 0026) only when the --ssm-bf16-tau CLI flag is unset.
         // Unset / non-positive => env untouched, so stock stays byte-identical and bit-exact (an
         // externally exported LLAMA_SSM_BF16_TAU still works as an escape hatch). NOTE: this mode is
-        // NOT bit-exact (~91% same-top-p ceiling); see patches/paged/README.md (Dev notes).
+        // NOT bit-exact (~91% same-top-p ceiling); see backend/cpp/llama-cpp-localai-paged/README.md (Dev notes).
         } else if (!strcmp(optname, "ssm_bf16_tau") || !strcmp(optname, "ssm_hybrid_tau")) {
             if (optval != NULL) {
                 try {