[PM-37255] feat: Consume fill-assist targeting rules data

[aj-rosado]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-37255

📔 Objective

Changes:

• ConfigResponseJson.EnvironmentJson — adds fillAssistRulesUrl: String? (@SerialName("fillAssistRules")) from the server config response
• FillAssistManifestJson — model for the CDN manifest file, with a version-keyed map (Map<String, FileEntryJson?>) so new schema versions appear automatically without model changes
• FillAssistFormsJson — model for the forms rules file; uses JsonElement for the composite selector array to handle both string and array-of-string alternatives
• FillAssistApi / FillAssistService / FillAssistServiceImpl — Retrofit service using @Url annotation with createStaticRetrofit() to bypass BaseUrlInterceptor (the fill-assist CDN is external to the Bitwarden API)
• BitwardenServiceClient — exposes fillAssistService
• PlatformNetworkModule — provides FillAssistService
• All EnvironmentJson test fixtures updated with fillAssistRulesUrl = null

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR adds the network layer for consuming fill-assist targeting rules from the Bitwarden fill-assist CDN. Changes include a new FillAssistService (interface + impl) with two endpoints (manifest and forms), corresponding JSON models with ignoreUnknownKeys-tolerant deserialization, a fillAssistRulesUrl field on EnvironmentJson (additive, backward-compatible), and Hilt wiring via PlatformNetworkModule. The code consistently follows existing service patterns (e.g., DownloadServiceImpl), uses createStaticRetrofit() with @Url to bypass BaseUrlInterceptor for the external CDN, and all EnvironmentJson test fixtures across both apps and the data/network modules have been updated. The previously flagged unrelated PolicyManager mock change in AuthRepositoryTest was reverted in f57a7d09a, leaving only the necessary fillAssistRulesUrl = null addition.

Code Review Details

No findings.

Notes on items considered and dismissed:

• FillAssistManifestJson.MapsJson.forms lacks a = null default unlike sibling nullable properties — harmless under the project's explicitNulls = false JSON config; pure consistency nit.
• getManifest(url:) vs getForms(formsUrl:) parameter naming differs slightly — cosmetic.
• New JSON model tests use a local Json { ignoreUnknownKeys = true } rather than CoreModule.providesJson(...) — acceptable for pure model decoding tests since contextual serializers and explicitNulls aren't exercised.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.47%. Comparing base (e7e2c26) to head (f57a7d0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6990      +/-   ##
==========================================
+ Coverage   85.63%   86.47%   +0.84%     
==========================================
  Files        1004      873     -131     
  Lines       66223    63670    -2553     
  Branches     9299     9234      -65     
==========================================
- Hits        56710    55059    -1651     
+ Misses       6321     5436     -885     
+ Partials     3192     3175      -17     

Flag	Coverage Δ
app-data	17.23% <0.00%> (+0.19%)	⬆️
app-ui-auth-tools	19.02% <0.00%> (-0.18%)	⬇️
app-ui-platform	16.49% <0.00%> (-0.56%)	⬇️
app-ui-vault	27.81% <0.00%> (-0.57%)	⬇️
authenticator	6.21% <0.00%> (-0.05%)	⬇️
lib-core-network-bridge	4.11% <100.00%> (-0.01%)	⬇️
lib-data-ui	1.15% <0.00%> (-0.01%)	⬇️

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