feat(compress): move dedicated dict param reversion to Rust

Port ZSTD_dedicatedDictSearch_revertCParams to a Rust leaf that accepts and
returns the complete repr(C) compression-parameter struct. Keep the existing
C pointer wrapper and call order before ZSTD_adjustCParams_internal, while
changing only hashLog for greedy, lazy, and lazy2 strategies.

Test Plan:
- cargo test --manifest-path rust/Cargo.toml --no-default-features --features compression
- cargo clippy --manifest-path rust/Cargo.toml --no-default-features --features compression (and --benches/--tests, rerun after fmt)
- cargo +nightly fmt --manifest-path rust/Cargo.toml
- make -B -C lib -j2 lib
- make -B -C tests -j2 fuzzer
- tests/fuzzer -s4560 -t47 -i48 -v
- tests/fuzzer -s4560 -t57 -i1057 -v
- make -B -C tests -j2 test-zstream
- git diff --check

lib/compress/zstd_compress.c

@@ -132,7 +132,8 @@ int ZSTD_rust_params_resolveExternalRepcodeSearch(int mode, int cLevel);
 int ZSTD_rust_params_cdictIndicesAreTagged(ZSTD_compressionParameters cParams);
 int ZSTD_rust_params_dedicatedDictSearchIsSupported(ZSTD_compressionParameters cParams);
 U32 ZSTD_rust_params_dedicatedDictSearch_getHashLog(U32 hashLog);
-U32 ZSTD_rust_params_dedicatedDictSearch_revertHashLog(U32 hashLog);
+ZSTD_compressionParameters
+ZSTD_rust_params_dedicatedDictSearch_revertCParams(ZSTD_compressionParameters cParams);
 int ZSTD_rust_params_shouldAttachDict(int strategy, int dedicatedDictSearch,
                                       U64 pledgedSrcSize, int attachDictPref,
                                       int forceWindow);
@@ -5678,21 +5679,7 @@ static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const
  */
 static void ZSTD_dedicatedDictSearch_revertCParams(
         ZSTD_compressionParameters* cParams) {
-    switch (cParams->strategy) {
-        case ZSTD_fast:
-        case ZSTD_dfast:
-            break;
-        case ZSTD_greedy:
-        case ZSTD_lazy:
-        case ZSTD_lazy2:
-            cParams->hashLog = ZSTD_rust_params_dedicatedDictSearch_revertHashLog(cParams->hashLog);
-            break;
-        case ZSTD_btlazy2:
-        case ZSTD_btopt:
-        case ZSTD_btultra:
-        case ZSTD_btultra2:
-            break;
-    }
+    *cParams = ZSTD_rust_params_dedicatedDictSearch_revertCParams(*cParams);
 }
 
 /*! ZSTD_getCParams_internal() :