fix(db): restore channel-aware path — ECS was opening wrong database file

[hblanken]

Root cause

The ECS deployment after PR #72/#73 was opening a fresh opencode.db while all production data lived in opencode-local.db. This caused the drizzle SQL migration to immediately crash with:

Failed to run the query 'ALTER TABLE `session` ADD `metadata` text;'

Because the fresh opencode.db had no session table yet.

Why this happened

The upstream sync (PR #72) simplified getPath() in db.ts to always return opencode.db:

// NEW (broken in ECS)
return path.join(Global.Path.data, "opencode.db")

But packages/core/src/database/database.ts uses a channel-suffixed path, and the pre-PR72 db.ts also used a channel-aware path. When OPENCODE_CHANNEL is not bundled (which is the case on ECS, since the server runs from TypeScript source), InstallationChannel = "local" and the channel path is opencode-local.db.

So in ECS:

	Path opened
Old db.ts	opencode-local.db ✓
database.ts	opencode-local.db ✓
New db.ts (broken)	opencode.db ✗
New db.ts (fixed)	opencode-local.db ✓

Fix

Restore the channel-suffix logic in db.ts's getPath(), matching both the old behavior and database.ts. Also adds OPENCODE_DISABLE_CHANNEL_DB support for parity with database.ts.

Verification

Tested with a production-accurate EFS database (20 old SQL migration records, full schema at opencode-local.db):

[db] opening database { path: "...opencode-local.db" }
[db] applying migrations { count: 1, mode: "dev" }
opencode server listening on http://0.0.0.0:4097

Server starts cleanly. PR #74's legacy migration seeding fix still runs correctly on top of this.

Next steps

Merge this PR, then trigger deploy-collab.yml.

[coderabbitai]

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