[ADD] marketplace product sync framework (Trendyol + Hepsiburada)

[yibudak]

Summary

• Adds a generic product-sync foundation in marketplace_integration_base (4 abstract mixins: product binding, category, brand, batch request) plus shared product.template fields for desi / warranty / lot / video URL, an image_url Char on base_multi_image.image for multi-image payloads, and a backend extension covering auto_export_products, auto_sync_stock_price, last_product_sync, etc.
• Refactors trendyol_integration onto the new mixins and expands the v1 payload to include up to 8 images, lotNumber, deliveryOption{deliveryDuration, fastDeliveryType}, shipmentAddressId, returningAddressId, plus a category-level cargoCompanyId override; adds v2 endpoints (create_products_v2, update_approved_products, update_unapproved_products).
• Builds the full Hepsiburada catalog + listing flow from scratch: mpop and listing service URLs, ~17 new client methods, hepsiburada.{category, brand, product.binding, batch.request} models, product-export + category-sync wizards, queue channels (root.hepsiburada.product / .stock), crons for stock-price sync and batch polling, ACLs, views, menus.
• Adds is_published_trendyol / is_published_hepsiburada Booleans on product.template, product.product, product.category (mirrors the existing is_published pattern from altinkaya_ecommerce).
• Drops all non-Turkish .po files and completes Turkish translations (1460 entries, including 146 already-Turkish legacy Altinkaya field labels passed through verbatim).

Test plan

• Restart Odoo with -u marketplace_integration_base,trendyol_integration,hepsiburada_integration and confirm the upgrade completes without error.
• Configure a Trendyol backend with the new fields (default_cargo_company_external_id, default_shipment_address_id, default_returning_address_id, default_delivery_duration, default_fast_delivery_type) and verify Test Connection passes.
• Configure a Hepsiburada backend with the new listing defaults and verify Test Connection passes.
• Run Sync Categories + Sync Brands on Trendyol; run the new HB category-sync wizard and verify categories + leaf attributes appear.
• Mark a leaf category and a sample product+variants with is_published_trendyol / is_published_hepsiburada; set image_url on a few base_multi_image.image records.
• Use the export wizards to create bindings; click Export to Trendyol / Submit to HB Catalog and confirm the queue jobs hit the marketplace APIs and create batch_request rows.
• Confirm Trendyol payload contains up to 8 images, lotNumber, deliveryOption; confirm HB payload contains Image1..Image5, Marka, GarantiSuresi.
• Trigger the stock/price sync crons and verify only delta records are sent (last_sent_quantity / last_sent_price machinery).
• Toggle a product's is_published_trendyol = False and confirm it falls out of the export domain.
• Verify pre-commit run -a passes on repos/odoo-addons/.

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