Remove poly-workshop/go-webmods dependency and internalize required packages

[Copilot]

Removes the external github.com/poly-workshop/go-webmods dependency by implementing the required functionality directly in internal/pkg/.

New Internal Packages

• internal/pkg/app - Viper config loading + slog/tint logging initialization
• internal/pkg/gormclient - GORM factory for PostgreSQL, MySQL, SQLite
• internal/pkg/mongoclient - MongoDB client factory
• internal/pkg/redisclient - Redis client + distributed cache with pub/sub invalidation
• internal/pkg/smtpmailer - SMTP email sender
• internal/pkg/grpcutils - Request ID interceptor

Updated Imports

All references in cmd/, internal/infrastructure/, and internal/application/ updated to use new internal packages.

// Before
import "github.com/poly-workshop/go-webmods/app"

// After
import "github.com/poly-workshop/identra/internal/pkg/app"

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove poly-workshop/go-webmods requirements and implement the needed code in this repo</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove poly-workshop/go-webmods requirements and implement the needed code in this repo #9

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