♻️ refactor(obikpartitionner): replace low-level I/O with obiskio::SKFileWriter

- Replace `limits` module and raw binary I/O with a new high-level abstraction using obiskio::SKFileWriter
- Remove `niffler` dependency and compression logic (Gzip/Zstd/Lz4/Bgzf)
- Simplify PartitionManager to manage partitioned file writers based on kmer hashing
  * Uses `n_partition_bits` for bitmask-based partition selection (2^n partitions)
- Add obiskio as a local dependency
Note: This is likely part of aligning with unified I/O primitives in the obiskio crate.

src/Cargo.lock

@@ -781,6 +781,9 @@ dependencies = [
 [[package]]
 name = "obikpartitionner"
 version = "0.1.0"
+dependencies = [
+ "obiskio",
+]
 
 [[package]]
 name = "obikrope"
@@ -796,6 +799,7 @@ version = "0.1.0"
 dependencies = [
  "bitvec",
  "criterion2",
+ "xxhash-rust",
 ]
 
 [[package]]