MM-573: Sanitize tenant and auth headers to prevent header injection

[Divyateja2709]

hi @therajanmaurya sir

This PR introduces a focused security hardening update in the network layer for MM-573 (Cipher 2026 remediation).
It sanitizes dynamic header values before request injection to reduce malformed-input and header-injection risk.

Changes included
Updated core/network/src/commonMain/kotlin/org/mifospay/core/network/config/InstanceConfigManager.kt

Sanitized platformTenantId in getPlatformTenantId()
Added normalization: trim, remove CR/LF, apply max length cap
Enforced tenant format: [A-Za-z0-9_-]+
Added safe fallback to default tenant when value is empty/invalid
Updated core/network/src/commonMain/kotlin/org/mifospay/core/network/utils/KtorInterceptor.kt

Added sanitizeHeaderValue() helper
Sanitized token before setting Authorization header in both interceptor paths
Skipped Authorization header when sanitized token becomes empty
Why this change
Prevents CR/LF-based header injection vectors in tenant/token values
Improves robustness when config or stored token data is malformed
Keeps scope intentionally small and low-risk for fast review
Validation
IDE lint checks on edited files passed (no new lint issues)
Full build/test execution was not run in this environment due to missing JAVA_HOME

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Reviewing files that changed from the base of the PR and between d399e0a and cbb9b99.

📒 Files selected for processing (2)

• core/network/src/commonMain/kotlin/org/mifospay/core/network/config/InstanceConfigManager.kt
• core/network/src/commonMain/kotlin/org/mifospay/core/network/utils/KtorInterceptor.kt

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