chore: Relicense from LGPL-3.0 to MPL-2.0 and add automated license headers

[metabrixkt]

No description provided.

[Copilot]

Pull request overview

This PR relicenses the project from LGPL-3.0 to MPL-2.0 and introduces Gradle convention plugins to automate license headers and centralize publishing configuration.

Changes:

• Replace the repository LICENSE text with MPL-2.0 and update publishing metadata accordingly.
• Add Spotless-based automated license header enforcement via a licensing-conventions Gradle convention plugin.
• Split publishing/signing configuration into a dedicated publishing-conventions convention plugin and apply it to v3 modules.

Reviewed changes

Copilot reviewed 36 out of 36 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
LICENSE	Replaces LGPL-3.0 license text with MPL-2.0.
config/license-header.txt	Adds the template used for automated license headers.
gradle/libs.versions.toml	Adds the Spotless Gradle plugin to the version catalog.
buildSrc/src/main/kotlin/licensing-conventions.gradle.kts	New convention plugin configuring Spotless license headers for Kotlin and Gradle Kotlin DSL files.
buildSrc/src/main/kotlin/publishing-conventions.gradle.kts	New convention plugin centralizing Maven publishing + signing + POM metadata.
buildSrc/src/main/kotlin/kotlin-conventions.gradle.kts	Removes embedded publishing/signing configuration (now handled by publishing-conventions).
v3/api/build.gradle.kts	Applies new licensing-conventions and publishing-conventions plugins; adds license header.
v3/impl-java/build.gradle.kts	Applies new licensing-conventions and publishing-conventions plugins; adds license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/ProxyCheckApi.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/ProxyCheckApiException.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/common/CidrIpRange.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/common/ComparableInetAddress.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/request/RawRequestConfiguration.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/request/RequestConfiguration.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/AddressResult.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/AttackType.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Currency.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/DetectionHistory.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Detections.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/DeviceEstimate.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Location.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Network.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Operator.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/OperatorPolicies.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/OperatorService.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/RawResponse.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/Response.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/model/response/ResponseStatus.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/util/Extensions.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/util/IpUtil.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/util/VersionInfo.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/util/codec/Codecs.kt	Adds MPL-2.0 SPDX license header.
v3/api/src/main/kotlin/ru/epserv/proxycheck/v3/api/util/codec/KJsonOps.kt	Adds MPL-2.0 SPDX license header (before file annotation).
v3/impl-java/src/main/kotlin/ru/epserv/proxycheck/v3/impl/ProxyCheckApiImpl.kt	Adds MPL-2.0 SPDX license header.
v3/impl-java/src/main/kotlin/ru/epserv/proxycheck/v3/impl/ProxyCheckApiImplConfiguration.kt	Adds MPL-2.0 SPDX license header.
v3/impl-java/src/main/kotlin/ru/epserv/proxycheck/v3/impl/VersionInfoImpl.kt	Adds MPL-2.0 SPDX license header.

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