fix(bulk-predict): mount router so the csv template endpoint is reachable

[Rudra-clrscr]

Closes #1002

Problem

backend/routes/bulkPredict.js already correctly defines GET /bulk-predict/template (and its own POST /bulk-predict), but the router
was never required or mounted in server.js, so the template download
404'd.

Fix

A small, surgical 5-line change: require and mount bulkPredict.js at root,
placed after predictionRoutes (which already handles the real, active
POST /bulk-predict implementation). This ordering means
bulkPredict.js's own POST /bulk-predict handler stays shadowed —
intentionally, so this fix doesn't regress the working upload flow — while
its GET /bulk-predict/template, a path predictionRoutes.js doesn't
define, becomes reachable.

Left the now-shadowed duplicate POST /bulk-predict handler in
bulkPredict.js as-is with a comment explaining why; removing it is a
separate cleanup out of scope here.

Verification

node --check and eslint clean (identical to unmodified upstream/main
on both touched files — no new issues). Functional check via curl against
a merged tree combined with fix/backend-boot-crash (needed since
bulkPredictController.js transitively requires a service file that didn't
exist until that PR): GET /bulk-predict/template → 200, real CSV body;
the existing POST /bulk-predict flow unaffected.

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