feat: Add Feishu adaptive card webhook routing logic

[projectedanx]

Integration of a zero-trust webhook ingress routing system designed to translate human semantic input into authenticated, schema-bound Feishu Adaptive Cards.

• Implemented Token Escrow Mechanism with a TTL-enforced dictionary cache (6900s expiration) for tenant_access_token.
• Added Cryptographic Veto via X-Lark-Signature verification middleware (SHA256(timestamp + nonce + encrypt_key + body)).
• Included AES-256-CBC decryption logic for encrypted Feishu payloads.
• Linked webhook ingress to paraconsistent_synthesis routing logic and executed DCCDSchemaGuard constraints.
• Logged structural anomalies in SymbolicScar.json.
• Implemented unit tests for URL Verification Challenge, AES decryption, signature rejection, and Schema validation.
• Updated README.md with Zero-Friction Quickstart guide following format constraints.

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PR created automatically by Jules for task 12931398895115843059 started by @projectedanx

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