feat(pskreporter): upload decoded spots to PSKReporter

[patrickrb]

Summary

Closes #78

• Uploads all decoded FT8 spots to PSKReporter using the IPFIX binary protocol over UDP (report.pskreporter.info:4739)
• Spots are deduplicated per callsign+band within a 5-minute window, batched every ~5 minutes with random jitter, and capped at 1400 bytes per datagram for MTU safety
• Templates are included in the first 3 packets and re-sent hourly per the PSKReporter spec
• Adds a settings toggle (default: ON) in Settings > Logging & Awards
• Adds INTERNET permission to AndroidManifest.xml
• Includes 13 unit tests validating IPFIX binary encoding (headers, templates, sender/receiver records, MTU splitting, sequence numbers)

Files changed

File	Change
AndroidManifest.xml	Add INTERNET permission
GeneralVariables.java	Add enablePskReporter boolean (default true)
DatabaseOpr.java	Load enablePskReporter from config DB
MainViewModel.java	Hook PskReporterSender.enqueue() in afterDecode(), lifecycle start/stop
SettingsScreen.kt	Add PSKReporter toggle in Logging & Awards section
PskReporterSender.kt	New — IPFIX encoder + UDP sender singleton
PskReporterSenderTest.kt	New — 13 unit tests for binary encoding
build.gradle	Add test dependencies (JUnit, Robolectric, Truth)

Test plan

• Build compiles without errors (./gradlew assembleDebug)
• PskReporterSenderTest passes all 13 tests
• Toggle appears in Settings > Logging & Awards, persists across restarts
• With toggle ON, decode some FT8 and check debug.log for PskReporterSender: entries showing spots queued and datagrams sent
• After ~5 min, visit pskreporter.info and search for your callsign as a reporter to confirm spots appear
• With toggle OFF, no spots are queued

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