feat(dashboard-api): LD-gated ClickHouse read switcher

[rguliyev]

What

Migrate dashboard-api to the LD-gated ClickHouse switching client, mirroring the api service (introduced in #3061). Replaces the single fixed-DSN client with clickhouse.NewSwitchingClient, gated on the clickhouse-read-endpoint flag, so dashboard-api reads can shift to the Aiven alternate in lock-step with api.

Why

dashboard-api was the only ClickHouse reader still hardwired to the single (legacy) DSN with no flag awareness — it would not follow the clickhouse-read-endpoint cutover. This brings it in line with api, data-exporter, argus-api, bot-detection, etc.

Changes

• internal/cfg/model.go: add ClickhouseConnectionStrings (alternates, ;-separated) and DomainName.
• main.go: build a feature-flags client, SetServiceName + SetDeploymentName(config.DomainName) (same deployment context as api, so both resolve to the same endpoint), and construct NewSwitchingClient(..., WithAllowNoopDefault(true)). The noop-default preserves the prior empty-DSN behavior.

Notes

• Requires the matching Terraform change to set CLICKHOUSE_CONNECTION_STRINGS + DOMAIN_NAME on the dashboard-api job (separate PR in the terraform repo).
• go build / go vet / gofmt clean.

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[gemini-code-assist]

Code Review

This pull request updates the dashboard API configuration to support multiple ClickHouse connection strings and a domain name, and integrates a feature flags client to enable dynamic ClickHouse endpoint switching via a new switching client. There are no review comments, and we have no feedback to provide.

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[codecov]

❌ 7 Tests Failed:

Tests completed	Failed	Passed	Skipped
3086	7	3079	8

View the top 3 failed test(s) by shortest run time

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestListDir/depth_0_lists_only_root_directory

Stack Traces | 0.01s run time

=== RUN   TestListDir/depth_0_lists_only_root_directory
=== PAUSE TestListDir/depth_0_lists_only_root_directory
=== CONT  TestListDir/depth_0_lists_only_root_directory
    filesystem_test.go:96: 
        	Error Trace:	.../tests/envd/filesystem_test.go:96
        	Error:      	Received unexpected error:
        	            	unavailable: 502 Bad Gateway
        	Test:       	TestListDir/depth_0_lists_only_root_directory
--- FAIL: TestListDir/depth_0_lists_only_root_directory (0.01s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestListDir/depth_1_lists_root_directory

Stack Traces | 0.01s run time

=== RUN   TestListDir/depth_1_lists_root_directory
=== PAUSE TestListDir/depth_1_lists_root_directory
=== CONT  TestListDir/depth_1_lists_root_directory
    filesystem_test.go:96: 
        	Error Trace:	.../tests/envd/filesystem_test.go:96
        	Error:      	Received unexpected error:
        	            	unavailable: 502 Bad Gateway
        	Test:       	TestListDir/depth_1_lists_root_directory
--- FAIL: TestListDir/depth_1_lists_root_directory (0.01s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory)

Stack Traces | 0.01s run time

=== RUN   TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory)
=== PAUSE TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory)
=== CONT  TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory)
    filesystem_test.go:96: 
        	Error Trace:	.../tests/envd/filesystem_test.go:96
        	Error:      	Received unexpected error:
        	            	unavailable: 502 Bad Gateway
        	Test:       	TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory)
--- FAIL: TestListDir/depth_2_lists_first_level_of_subdirectories_(in_this_case_the_root_directory) (0.01s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestListDir/depth_3_lists_all_directories_and_files

Stack Traces | 0.01s run time

=== RUN   TestListDir/depth_3_lists_all_directories_and_files
=== PAUSE TestListDir/depth_3_lists_all_directories_and_files
=== CONT  TestListDir/depth_3_lists_all_directories_and_files
    filesystem_test.go:96: 
        	Error Trace:	.../tests/envd/filesystem_test.go:96
        	Error:      	Received unexpected error:
        	            	unavailable: 502 Bad Gateway
        	Test:       	TestListDir/depth_3_lists_all_directories_and_files
--- FAIL: TestListDir/depth_3_lists_all_directories_and_files (0.01s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestListDir

Stack Traces | 0.52s run time

=== RUN   TestListDir
=== PAUSE TestListDir
=== CONT  TestListDir
--- FAIL: TestListDir (0.52s)

github.com/e2b-dev/infra/tests/integration/internal/tests/api/templates::TestSandboxCreateWithTag

Stack Traces | 150s run time

=== RUN   TestSandboxCreateWithTag
=== PAUSE TestSandboxCreateWithTag
=== CONT  TestSandboxCreateWithTag
    template_tags_test.go:115: Build failed: {<nil> build was cancelled <nil>}
--- FAIL: TestSandboxCreateWithTag (150.41s)

github.com/e2b-dev/infra/tests/integration/internal/tests/api/templates::TestSandboxCreateWithAliasAndTag

Stack Traces | 156s run time

=== RUN   TestSandboxCreateWithAliasAndTag
=== PAUSE TestSandboxCreateWithAliasAndTag
=== CONT  TestSandboxCreateWithAliasAndTag
    template_tags_test.go:207: Build failed: {<nil> build was cancelled <nil>}
--- FAIL: TestSandboxCreateWithAliasAndTag (155.62s)

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