feat: implement Textual TUI and SQLite database for sensor management

Tasks.md

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+# Tasks
+
+## Task: TUI Enhancements (Phase 2)
+
+**Goal**: Add live data, global config, and dashboard.
+
+### Sub-tasks:
+- [ ] **Live Data Integration**:
+    - [ ] Implement a message bus or shared state to feed live BLE readings into the TUI.
+    - [ ] Create a "Live Dashboard" view with real-time gauges/sparklines.
+- [ ] **Global Configuration**:
+    - [ ] Create a form-based view to edit `sensorpajen.env` values.
+- [ ] **System Dashboard**:
+    - [ ] Add system stats (CPU, Temp, Memory) relevant for Raspberry Pi.
+    - [ ] Add service control buttons (Restart, Stop).