deps(server,sdk): bump compio to 0.18.0 with unified feature-based imports

[hubcio]

Consolidate compio-io, compio-net, compio-quic, compio-tls, compio-ws
into single compio crate with feature flags. This ensures version
consistency and simplifies imports from compio_* to compio::*.

[codecov]

Codecov Report

❌ Patch coverage is 86.27451% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.53%. Comparing base (bdf0b2e) to head (50fbf0f).

Files with missing lines	Patch %	Lines
core/common/src/sender/quic_sender.rs	76.92%	0 Missing and 3 partials ⚠️
core/server/src/quic/listener.rs	66.66%	0 Missing and 2 partials ⚠️
core/common/src/alloc/buffer.rs	88.88%	1 Missing ⚠️
core/server/src/quic/quic_server.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2650      +/-   ##
==========================================
+ Coverage   69.51%   69.53%   +0.02%     
==========================================
  Files         568      568              
  Lines       55238    55238              
  Branches    55238    55238              
==========================================
+ Hits        38399    38411      +12     
+ Misses      14960    14949      -11     
+ Partials     1879     1878       -1     

Flag	Coverage Δ
rust	69.53% <86.27%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
core/common/src/sender/mod.rs	90.47% <ø> (ø)
core/common/src/sender/tcp_tls_sender.rs	53.57% <ø> (ø)
core/common/src/sender/websocket_sender.rs	67.79% <100.00%> (+1.12%)	⬆️
core/common/src/sender/websocket_tls_sender.rs	71.15% <100.00%> (+1.15%)	⬆️
core/server/src/http/http_server.rs	48.08% <100.00%> (ø)
core/server/src/server_error.rs	0.00% <ø> (ø)
core/server/src/shard/handlers.rs	86.06% <ø> (ø)
core/server/src/tcp/tcp_listener.rs	78.33% <100.00%> (ø)
core/server/src/tcp/tcp_tls_listener.rs	64.47% <100.00%> (ø)
core/server/src/websocket/websocket_listener.rs	76.53% <100.00%> (ø)
... and 5 more

... and 9 files with indirect coverage changes

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