fix(preamble): 新增 \newacronym cp/ip 词条

为多帧动态模型的 CP/IP 提供 \gls 词条，full form 取 continuous-phase /
independent-phase（与 efim 的小写 full form 同风格）。供 sec6/G 正文统一
用 \gls{cp}/\gls{ip}；数学上标 ^{\mathrm{cp}}、标签、复合名 CP-K 等不走 \gls。

doa_doppler_est.tex

@@ -94,6 +94,7 @@
 \newacronym{crlb}{CRLB}{Cramér–Rao Lower Bound}
 \newacronym{cdml}{CDML}{Concentrated Deterministic Maximum Likelihood}
 \newacronym{cpi}{CPI}{Coherent Processing Interval}
+\newacronym{cp}{CP}{continuous-phase}
 \newacronym{csml}{CSML}{Concentrated Stochastic Maximum Likelihood}
 \newacronym{dml}{DML}{Deterministic Maximum Likelihood}
 \newacronym{doa}{DoA}{Direction-of-Arrival}
@@ -103,6 +104,7 @@
 \newacronym{esprit}{ESPRIT}{Estimation of Signal Parameters via Rotational Invariant Techniques}
 \newacronym{fdoa}{FDOA}{Frequency Difference of Arrival}
 \newacronym{fim}{FIM}{Fisher Information Matrix}
+\newacronym{ip}{IP}{independent-phase}
 \newacronym{leo}{LEO}{Low Earth Orbit}
 \newacronym{mle}{MLE}{Maximum Likelihood Estimation}
 \newacronym{mse}{MSE}{Mean Square Error}