Add unit tests for analytics, fallback client, and refactored validators

- Implemented comprehensive unit tests for the BuddAI Analytics module, covering fallback statistics calculations.
- Created tests for the FallbackClient to ensure proper escalation to various AI models and handling of missing API keys.
- Developed unit tests for the refactored validator system, validating various hardware and coding standards.
- Established a base validator interface and implemented specific validators for ESP32, Arduino, motor control, memory safety, and more.
- Enhanced the validator registry to auto-discover and manage validators effectively.
- Included detailed validation logic for common issues in embedded systems programming, such as unused variables, safety timeouts, and coding style violations.

core/buddai_storage.py

@@ -112,6 +112,20 @@ class StorageManager:
             )
         """)
 
+        cursor.execute("""
+            CREATE TABLE IF NOT EXISTS fallback_solutions (
+                id INTEGER PRIMARY KEY,
+                timestamp TEXT,
+                user_request TEXT,
+                buddai_attempt TEXT,
+                buddai_confidence REAL,
+                fallback_model TEXT,
+                fallback_solution TEXT,
+                validation_improved BOOLEAN,
+                learned_pattern TEXT
+            )
+        """)
+
         # Migrations (Idempotent)
         try: cursor.execute("ALTER TABLE sessions ADD COLUMN title TEXT")
         except: pass