Initial Bobink library: BobinkAuth, BobinkClient, and demo app

Implements the core OPC UA wrapper library with:
- Build system with automatic dep building (open62541, QtOpcUa)
- BobinkAuth: QML auth component (anonymous/userpass/certificate)
- BobinkClient: QML singleton managing connection, LDS discovery,
  PKI configuration, endpoint selection, and certificate trust flow
- Demo app for manual testing of the full connection flow

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diff --git a/deps/open62541 b/deps/open62541
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+Subproject 484348f3076da13a9d0971f3d66ffe57ab3b7a9
diff --git a/deps/qtopcua b/deps/qtopcua
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+Subproject 2c227fa036d1b9215c8ec67bdd71fa3621e7889