Add ammunition product submission template

.gitea/issue_template/config.yaml

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+blank_issues_enabled: true
+
+contact_links:
+  - name: Product image guidelines
+    url: https://git.ddr4.net/dragon757/RoundCount-Catalog/src/branch/main/docs/image-guidelines.md
+    about: Review the image requirements before submitting a product photograph.

.gitea/issue_template/product-submission.md

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+---
+name: Product submission
+about: Submit a new ammunition product for the RoundCount Catalog
+title: "[Product] Manufacturer - Product Name"
+labels:
+  - catalog
+  - product-submission
+---
+
+## Product Identification
+
+**Manufacturer:**
+
+**Brand or product line:**
+
+**Product name:**
+
+**UPC / GTIN:**
+
+**Manufacturer SKU:**
+
+**Caliber:**
+
+---
+
+## Bullet Information
+
+**Bullet weight in grains:**
+
+**Bullet type:**
+
+Examples:
+
+- FMJ
+- JHP
+- JSP
+- Soft Point
+- Hollow Point
+- Open Tip Match
+- Lead Round Nose
+- Shot
+
+**Bullet material or construction:**
+
+---
+
+## Case and Primer
+
+**Case material:**
+
+- [ ] Brass
+- [ ] Steel
+- [ ] Aluminum
+- [ ] Nickel-plated brass
+- [ ] Other
+
+**Reloadable:**
+
+- [ ] Yes
+- [ ] No
+- [ ] Unknown
+
+**Primer type:**
+
+- [ ] Boxer
+- [ ] Berdan
+- [ ] Rimfire
+- [ ] Unknown
+
+**Primer sealed:**
+
+- [ ] Yes
+- [ ] No
+- [ ] Unknown
+
+---
+
+## Package Information
+
+**Rounds per box:**
+
+**Boxes per case:**
+
+**Total rounds per case:**
+
+---
+
+## Ballistics
+
+**Advertised muzzle velocity:**
+
+**Advertised muzzle energy:**
+
+**Test barrel length:**
+
+Leave fields blank when the manufacturer does not provide the information.
+
+---
+
+## Product Image
+
+**Image available:**
+
+- [ ] Yes
+- [ ] No
+
+**Image source:**
+
+- [ ] Original photograph
+- [ ] Manufacturer
+- [ ] Distributor
+- [ ] Retailer
+- [ ] Other
+
+**Image URL or attachment:**
+
+Do not include personal information, receipts, shipping labels, or storage information.
+
+---
+
+## Sources
+
+Provide at least one source when possible.
+
+**Manufacturer product page:**
+
+**Distributor or retailer page:**
+
+**Photograph of packaging or label:**
+
+**Other source:**
+
+---
+
+## Additional Notes
+
+Include alternate UPCs, packaging differences, discontinued status, lot-specific differences, or any other useful information.
+
+---
+
+## Submission Checklist
+
+- [ ] UPC was copied exactly as printed
+- [ ] Leading zeroes were preserved
+- [ ] Manufacturer SKU was copied exactly
+- [ ] Caliber and bullet weight were confirmed
+- [ ] Package quantity was confirmed
+- [ ] Sources were included
+- [ ] Image meets the catalog image guidelines
+- [ ] No personal inventory information was included