feat(framework): remove --keystore-factory support from FullNode

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What does this PR do?

close #6949
Removes the deprecated --keystore-factory CLI from FullNode.jar. Keystore management moved to Toolkit.jar keystore <new|import|list|update> in GreatVoyage-v4.8.2 (#6637); this PR deletes the legacy shim left behind:

• KeystoreFactory and its dispatch branch in FullNode.main
• the CommonParameter.keystoreFactory field and the Args parameter plumbing
• KeystoreFactoryDeprecationTest (its subject is gone)

The option stays declared in CLIParameter as a tombstone: passing it now exits with status 1 and prints the Toolkit replacement, including an --sm2 note for SM2 nodes — the legacy mode followed crypto.engine, while the Toolkit commands default to ECDSA. Undeclaring the option instead would let JCommander parse the flag as a positional seed-node address and fail with a misleading error.

Why are these changes required?

FullNode.jar is the node binary; it should not ship an interactive key-management REPL that reads private keys and passwords from stdin now that Toolkit.jar keystore is the supported implementation of the same operations. Two implementations drift. Deprecation shipped in GreatVoyage-v4.8.2, giving one full release of warning before removal.

This PR has been tested by:

• Unit Tests: ArgsTest updated to stop passing the flag; keystore library tests (org.tron.keystore, 60 tests) unchanged and passing
• Manual Testing:
  • FullNode.jar --keystore-factory → exit 1, stderr names the Toolkit replacement
  • FullNode.jar --keystore-factory --help → exit 0, prints normal help; --help no longer lists the flag
  • Private chain: a witness configured via localwitnesskeystore + --password loads the keystore and produces blocks — the witness keystore startup path is unaffected

Follow up

Extra details

Breaking change: java -jar FullNode.jar --keystore-factory stops working. Keystore file format and existing keystores are unaffected. The public KeystoreFactory class and the CommonParameter.keystoreFactory Lombok accessors are removed with it — internal API, source-level breakage only for out-of-tree code compiling against these modules.

WalletUtils.inputPassword2Twice() is removed as well: its last callers were the REPL's GenKeystore/ImportPrivateKey commands, and the Toolkit keystore commands implement their own password confirmation.

Behavior change worth a release note: the legacy REPL read from plain stdin, so a private key could be piped in (printf ... | java -jar FullNode.jar --keystore-factory) without ever being written to disk. Toolkit keystore import does not read stdin, and --key-file accepts only a regular file (symlinks and FIFOs are rejected by design), so non-interactive imports now require the plaintext key in a file on disk. Create it with restrictive permissions and delete it immediately after the import:

(umask 077; printf '%s\n' "$PRIVATE_KEY" > key.txt)
java -jar Toolkit.jar keystore import --key-file key.txt --password-file pass.txt
shred -u key.txt 2>/dev/null || rm -f key.txt