feat(cli): support OpenCode SQLite parsing with JSON fallback

[agusmdev]

What changed

• Updated OpenCodeParser to read usage messages from OpenCode's current SQLite database (opencode.db) by parsing rows from the message table.
• Kept backward compatibility with legacy JSON message files under storage/message.
• Added deduplication by message ID when both SQLite and JSON data are present, avoiding double-counting.
• Extended incremental sync behavior to track both SQLite file metadata and JSON file checkpoints.
• Updated CLI help/docs text to describe the new primary OpenCode data location and fallback.
• Added integration tests covering SQLite-only, JSON-only, and mixed-mode parsing.

Why

OpenCode migrated storage to SQLite, so the parser needs to support the new source format while preserving compatibility for users on older versions or mixed local data.

Validation

• Ran: bun test src/parsers/opencode.integration.test.ts
• Result: 3 tests passed
• Note: full typecheck could not be completed in this environment due missing local TS type dependencies setup (bun-types/@types/node).

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