feat: Implement pairing synchronization from Kraken and enhance market data feed

- Added `sync_pairings_from_kraken` function to fetch and upsert asset pairs into the config_pairings table.
- Introduced `run_pairing_sync_loop` for periodic synchronization of pairings.
- Enhanced `KrakenWsClient` to manage subscribed symbols for market data feeds.
- Created `build_detector_from_enabled_pairings` to initialize cycle detection based on enabled pairings.
- Updated FastAPI app to start market data feed and pairing synchronization tasks.
- Added new API routes for managing pairings, including listing, toggling, and syncing from Kraken.
- Improved dashboard templates to display pairing options and allow user interaction for backtesting.
- Refactored database queries to streamline fetching and updating of pairing data.

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig is awesome: https://editorconfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{js,py}]
+charset = utf-8
+
+# 4 space indentation
+[*.py]
+indent_style = space
+indent_size = 4
+max_line_length = 120