sources: add missing headers to the install list

[jcelerier]

Problem

A number of public headers under src/ossia/... exist on disk but were not enumerated in src/ossia_sources.cmake. Because the install rules iterate over the *_HEADERS lists in that file, these headers were never installed into the SDK. Downstream JIT/SDK consumers that include them — directly, or transitively through already-installed sibling headers — then fail at configure/compile time with file not found.

Fix

Add the missing headers to the appropriate *_HEADERS group in ossia_sources.cmake, matching the surrounding ordering/grouping. Each added header sits alongside siblings that were already listed (e.g. other framing variants in network/sockets/, other detail/ utilities, the dense_protocol / phidgets/detail siblings, etc.).

Headers added (15)

• ossia/detail/sleep.hpp
• ossia/detail/thread_priority.hpp
• ossia/detail/unique_instance.hpp
• ossia/detail/yield.hpp
• ossia/network/http/http_client_request.hpp
• ossia/network/sockets/cobs_framing.hpp
• ossia/network/sockets/encoding.hpp
• ossia/network/sockets/fixed_length_framing.hpp
• ossia/network/sockets/stx_etx_framing.hpp
• ossia/network/sockets/var_size_prefix_framing.hpp
• ossia/protocols/dense/dense_protocol_configuration.hpp
• ossia/protocols/oscquery/http_requests.hpp
• ossia/protocols/oscquery/oscquery_fwd.hpp
• ossia/protocols/phidgets/detail/phidgetspp.hpp
• ossia/audio/asio_protocol.hpp

(http_client_request.hpp is added in both the API_HEADERS and OSSIA_OSCQUERY_HEADERS groups, matching the existing duplicate listing of the other network/http/ headers — hence 16 inserted lines for 15 unique headers.)

Deliberately skipped

• ossia/protocols/leapmotion/leapmotion_device.hpp — empty 0-byte stub, its .cpp is also empty, and leapmotion is not referenced by any CMake list or source. This is an intentionally-unbuilt placeholder, not a public API header.

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