configs: remove {brand}fix-{env}/ symlinks (workaround retired)

The fix-suffix symlinks (hanzofix-testnet, zoofix-devnet, etc.) were a
workaround for P-chain CreateChainTx name-collision against stale chain
rows from earlier bootstrap attempts. They duplicated the genesis blob
under a second path per (brand, env) pair, violating the "one canonical
way" rule.

Now that bootstrap-chain derives chain.name from the canonical genesis
content (commit 6046cdb), collision is impossible and the workaround
has no reason to exist. The configs/ directory is back to one canonical
{brand}-{env}/ per pair (4 brands x 3 envs = 12 directories).

11 symlinks removed:
  hanzofix-{devnet,testnet,mainnet}
  zoofix-{devnet,mainnet}
  spcfix-{devnet,mainnet}
  parsfix-{devnet,testnet,mainnet}

(spcfix-testnet was never created; zoofix-testnet was already gone.)

configs/hanzofix-devnet

@@ -1 +0,0 @@
-hanzo-devnet

configs/hanzofix-mainnet

@@ -1 +0,0 @@
-hanzo-mainnet

configs/hanzofix-testnet

@@ -1 +0,0 @@
-hanzo-testnet

configs/parsfix-devnet

@@ -1 +0,0 @@
-pars-devnet

configs/parsfix-mainnet

@@ -1 +0,0 @@
-pars-mainnet

configs/parsfix-testnet

@@ -1 +0,0 @@
-pars-testnet

configs/spcfix-devnet

@@ -1 +0,0 @@
-spc-devnet

configs/spcfix-mainnet

@@ -1 +0,0 @@
-spc-mainnet

configs/zoofix-devnet

@@ -1 +0,0 @@
-zoo-devnet

configs/zoofix-mainnet

@@ -1 +0,0 @@
-zoo-mainnet