feat: add NFT badges, i18n metadata, CID standards, and TTL archival …

[Alhaji-naira]

Description

This PR implements solutions for several open issues, enhancing protocol features, standardizing metadata, and optimizing storage:

• #43 Create Profile_Badges (Stellar NFT Integration) #44 (Stellar NFT Integration): Added logic to automatically detect fans who have supported a creator for over 12 consecutive months and emit a FanNftAwarded event, which can be picked up off-chain to mint "Top 1% Fan" badges.
• #46 Support for Multi-Language Metadata Fields #46 (Multi-Language Metadata): Introduced set_profile_cid and get_profile_cid functions to allow creators to link localized off-chain metadata (IPFS CIDs) for bios and tier descriptions.
• #50 Community Issue: "Standardizing Creator CIDs" #50 (Standardizing Creator CIDs): Proposed a standard JSON schema in GOVERNANCE.md (Version 1.0) with robust i18n support to ensure creator profiles are consistently indexed across all Stellar SocialFi apps.
• #17 Refactor Subscriber_Data for State Archival (TTL Bumping) #53 (State Archival & TTL Bumping): Implemented a strategic refactor utilizing a bump_instance_ttl helper. Active subscriptions and contract instances are dynamically bumped during deposits/withdrawals (subscribe, collect, top_up, cancel), while canceled/exhausted streams safely age out via temporary storage.

Testing

• Added unit tests for test_set_and_get_profile_cid metadata operations.
• Added unit tests for test_12_month_nft_badge_event_emission to guarantee gamification fidelity.
• Compiled and verified all strict Sybil protection and balance depletion edge cases are still passing.

CLOSES #44

CLOSES #46

CLOSES #50

CLOSES #53

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