feat: implement Phase 1 MVP of Implausibly

Working Android dashboard app for self-hosted Plausible Analytics CE.
Connects to Plausible API v2 (POST /api/v2/query), displays top stats,
visitor chart, top sources, and top pages with date range selection.

Architecture: Kotlin + Jetpack Compose + Material 3 + Hilt + Ktor +
SQLDelight + EncryptedSharedPreferences. Single :app module, four-layer
unidirectional data flow (UI → ViewModel → Repository → Data).

Includes: instance management, site list, caching with TTL per date
range, encrypted API key storage, custom Canvas visitor chart,
pull-to-refresh, and unit tests for API, cache, repository, and
domain model layers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/sqldelight/no/naiv/implausibly/StoredSite.sq

@@ -0,0 +1,19 @@
+-- SPDX-License-Identifier: GPL-3.0-only
+
+CREATE TABLE stored_sites (
+    site_id TEXT NOT NULL,
+    instance_id TEXT NOT NULL,
+    PRIMARY KEY (site_id, instance_id)
+);
+
+selectByInstance:
+SELECT * FROM stored_sites WHERE instance_id = ? ORDER BY site_id ASC;
+
+insert:
+INSERT OR IGNORE INTO stored_sites VALUES (?, ?);
+
+delete:
+DELETE FROM stored_sites WHERE site_id = ? AND instance_id = ?;
+
+deleteByInstance:
+DELETE FROM stored_sites WHERE instance_id = ?;