refactor(console): inject file service

[hjlarry]

Summary

• Resolve Console file upload and preview through the injected ApplicationServices.files instance instead of constructing FileService from db.engine.
• Register file response models in serialization mode and use dump_response as the response serialization boundary.
• Preserve the shared Trial upload helper, resource-tenant override, and existing multipart behavior.

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	61.96%	61.97%	+0.01%
Strict coverage	61.56%	61.58%	+0.01%
Typed symbols	43,251	43,266	+15
Untyped symbols	26,725	26,719	-6
Modules	3303	3303	0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.92%. Comparing base (af3bd48) to head (727e1c0).

Additional details and impacted files

@@                    Coverage Diff                    @@
##           refactor/web-app-file   #41603      +/-   ##
=========================================================
- Coverage                  86.97%   86.92%   -0.05%     
=========================================================
  Files                       5473     5310     -163     
  Lines                     310536   306058    -4478     
  Branches                   62504    61299    -1205     
=========================================================
- Hits                      270075   266053    -4022     
+ Misses                     35174    34719     -455     
+ Partials                    5287     5286       -1     

Flag	Coverage Δ
api	86.80% <100.00%> (-0.01%)	⬇️
cli	?

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[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-09-02 08:57:36.407760402 +0000
+++ /tmp/pyrefly_pr.txt	2026-09-02 08:57:27.163726497 +0000
@@ -434,6 +434,8 @@
   --> providers/vdb/vdb-vikingdb/tests/unit_tests/test_vikingdb_vector.py:76:5
 ERROR Object of class `ModuleType` has no attribute `VikingDBService` [missing-attribute]
   --> providers/vdb/vdb-vikingdb/tests/unit_tests/test_vikingdb_vector.py:77:5
+ERROR Argument `str | None` is not assignable to parameter `tenant_id` with type `str` in function `services.file_service.FileService.get_file_preview` [bad-argument-type]
+   --> controllers/console/files.py:149:93
 ERROR Object of class `FromClause` has no attribute `metadata` [missing-attribute]
   --> tests/helpers/legacy_model_type_migration.py:64:16
 ERROR Object of class `FromClause` has no attribute `metadata` [missing-attribute]
@@ -3583,7 +3585,7 @@
 ERROR `SimpleNamespace` is not assignable to attribute `request` with type `Request` [bad-assignment]
    --> tests/unit_tests/controllers/files/test_upload.py:414:26
 ERROR Object of class `FunctionType` has no attribute `__apidoc__` [missing-attribute]
-   --> tests/unit_tests/controllers/inner_api/app/test_dsl.py:261:18
+   --> tests/unit_tests/controllers/inner_api/app/test_dsl.py:259:18
 ERROR Missing argument `tenant_model` in function `protected_view` [missing-argument]
    --> tests/unit_tests/controllers/inner_api/plugin/test_plugin_wraps.py:257:40
 ERROR Missing argument `user_model` in function `protected_view` [missing-argument]