fix: remove non-existent 'size' column from upload_requests INSERTs

[pyramation]

Summary

The upload_requests table (generated by storage_module.sql in constructive-db) has no size column — size only exists on the files table. The plugin was including size in both upload_requests INSERT paths (normal upload and dedup), causing column "size" of relation "app_upload_requests" does not exist at runtime.

Plugin fix: Removes size from both INSERT statements and shifts the positional $N parameters accordingly.

Test fixture fix: Updates the simple-seed-storage upload_requests CREATE TABLE to match the actual generated schema — removes size, adds missing columns (actor_id, ip_address, user_agent).

Follow-up to PR #1012 which fixed mime_type/content_hash mismatches on the files table. Both bugs originated from the plugin SQL being written against assumed column names rather than the actual generated schema.

Review & Testing Checklist for Human

• Verify positional parameter alignment in both INSERTs: Removing size shifted all $N params. Confirm the dedup path (5 columns → 5 values + 2 literals) and normal path (5 columns → 5 values + 1 literal + 1 param) are correctly aligned
• Run the upload integration test (graphql/server-test) end-to-end to confirm requestUploadUrl → PUT → confirmUpload still works with the corrected column list
• Check for any test-data.sql that INSERTs into upload_requests — the fixture schema changed column set, so any seed data INSERTs would need updating too

Notes

• This is blocking the MinIO integration test in constructive-db PR Revert "fix(graphql-codegen): re-export input types from generated ORM index" #891 — that test hits this exact error at runtime
• After merge + publish, graphile-presigned-url-plugin needs a version bump so constructive-db can pick up the fix via lockfile update

Link to Devin session: https://app.devin.ai/sessions/18879be982854a40abe5c9b915aa4a84
Requested by: @pyramation

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