feat: Add local SQLite analytics tracking

- AnalyticsEvent: Data class for tracked events
- AnalyticsDao: Room DAO with CRUD operations
- AnalyticsDatabase: Room database singleton
- AnalyticsManager: High-level API for logging events
- Unit tests for AnalyticsEvent

Event types: page_view, session_start, session_end,
idle_reset, admin_access, config_sync, signage_rotate

Supports JSON/CSV export for admin panel integration.

gradle/libs.versions.toml

@@ -1,6 +1,7 @@
 [versions]
 agp = "8.2.2"
 kotlin = "1.9.22"
+ksp = "1.9.22-1.0.17"
 coreKtx = "1.12.0"
 junit = "4.13.2"
 junitVersion = "1.1.5"
@@ -11,6 +12,7 @@ activity = "1.8.2"
 constraintlayout = "2.1.4"
 webkit = "1.10.0"
 datastorePreferences = "1.0.0"
+room = "2.6.1"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -23,7 +25,11 @@ androidx-activity = { group = "androidx.activity", name = "activity", version.re
 androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
 androidx-webkit = { group = "androidx.webkit", name = "webkit", version.ref = "webkit" }
 androidx-datastore-preferences = { group = "androidx.datastore", name = "datastore-preferences", version.ref = "datastorePreferences" }
+androidx-room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+androidx-room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
+androidx-room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }